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Cal State Northridge 427 Andrew Ainsworth PhD

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  • Cal State Northridge427Andrew Ainsworth PhD

    Psy 427 - Cal State Northridge

  • Statistics AGAIN?What do we want to do with statistics?Organize and Describe patterns in dataTaking incomprehensible data and converting it to:Tables that summarize the dataGraphsExtract (i.e. INFER) meaning from dataInfer POPULATION values from SAMPLESHypothesis Testing GroupsHypothesis Testing Relation/Prediction

    Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • DescriptivesDisorganized DataPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Sheet1

    Comedy7Suspense8Comedy7Suspense7

    Drama8Horror7Drama5Comedy6

    Horror8Comedy5Drama3Drama3

    Suspense7Horror8Comedy6Suspense6

    Horror8Comedy6Drama7Horror9

    Drama5Horror9Drama6Suspense4

    Drama5Horror7Suspense3Suspense4

    Horror7Suspense5Horror10Suspense5

    Horror9Suspense6Comedy6Drama8

    Comedy7Comedy5Comedy4Drama4

    Sheet2

    Sheet3

  • DescriptivesReducing and Describing DataPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Book1

    Comedy7756576646ComedyDramaHorrorSuspense

    Drama85553763844373

    Horror887978971095374

    Suspense78563764455474

    6585

    6585

    6586

    6696

    7797

    7897

    78108

    ComedyDramaHorrorSuspense

    5.95.48.25.5

    GenreAverage Rating

    Comedy5.9

    Drama5.4

    Horror8.2

    Suspense5.5

    Sheet2

    Sheet3

  • DescriptivesDisplaying DataPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Chart1

    5.9

    5.4

    8.2

    5.5

    Average Rating

    Genre

    Average Rating

    Rating of Movie Genre Enjoyment

    Book1

    Comedy7756576646ComedyDramaHorrorSuspense

    Drama85553763844373

    Horror887978971095374

    Suspense78563764455474

    6585

    6585

    6586

    6696

    7797

    7897

    78108

    ComedyDramaHorrorSuspense

    5.95.48.25.5

    GenreAverage Rating

    Comedy5.9

    Drama5.4

    Horror8.2

    Suspense5.5

    Book1

    Average Rating

    Genre

    Average Rating

    Rating of Movie Genre Enjoyment

    Sheet2

    Sheet3

  • InferentialInferential statistics:Is a set of procedures to infer information about a population based upon characteristics from samples.Samples are taken from PopulationsSample Statistics are used to infer population parametersPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • InferentialPopulation is the complete set of people, animals, events or objects that share a common characteristicA sample is some subset or subsets, selected from the population.representative simple random sample.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • InferentialDoes the number of hours students study per day affect the grade they are likely to receive in statistics (320)?Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • InferentialSometimes manipulation is not possible Is prediction possible?Can a relationship be established?E.g., number of cigarettes smoked by per and the likelihood of getting lung cancer,The level of child abuse in the home and the severity of later psychiatric problems.Use of the death penalty and the level of crime.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • InferentialMeasured constructs can be assessed for co-relation (where the coefficient of correlation varies between -1 to +1)

    Regression analysis can be used to assess whether a measured construct predicts the values on another measured construct (or multiple) (e.g., the level of crime given the level of death penalty usage).Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • MeasurementStatistical analyses depend upon the measurement characteristics of the data.Measurement is a process of assigning numbers to constructs following a set of rules.We normally measure variables into one of four different levels of measurement:NominalOrdinalIntervalRatioPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Ordinal MeasurementWhere Numbers Representative Relative Size OnlyPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Interval Measurement:

    Where Equal Differences Between Numbers Represent Equal Differences in SizePsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • MeasurementRatio Scale MeasurementIn ratio scale measurement there are four kinds of information conveyed by the numbers assigned to represent a variable:Everything Interval Measurement Contains PlusA meaningful 0-point and therefore meaningful ratios among measurements.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • True Zero pointPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • MeasurementRatio Scale MeasurementIf we have a true ratio scale, where 0 represents an a complete absence of the variable in question, then we form a meaningful ratio among the scale values such as:

    However, if 0 is not a true absence of the variable, then the ratio 4/2 = 2 is not meaningful.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Percentiles and Percentile RanksA percentile is the score at which a specified percentage of scores in a distribution fall belowTo say a score 53 is in the 75th percentile is to say that 75% of all scores are less than 53 The percentile rank of a score indicates the percentage of scores in the distribution that fall at or below that score. Thus, for example, to say that the percentile rank of 53 is 75, is to say that 75% of the scores on the exam are less than 53.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • PercentileScores which divide distributions into specific proportionsPercentiles = hundredthsP1, P2, P3, P97, P98, P99Quartiles = quartersQ1, Q2, Q3Deciles = tenthsD1, D2, D3, D4, D5, D6, D7, D8, D9Percentiles are the SCORESPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Percentile RankWhat percent of the scores fall below a particular score?

    Percentile Ranks are the Ranks not the scoresPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Example: Percentile RankRanking no ties just number them

    Ranking with ties - assign midpoint to tiesPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Sheet1

    Score:134567810

    Rank:12345678

    Sheet2

    Sheet3

    Sheet1

    Score:134567810

    Rank:12345678

    Score:13466888

    Rank:1234.54.5777

    Sheet2

    Sheet3

  • Steps to Calculating Percentile Ranks

    Example:Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Step 1

    Step 2

    Step 3

    Step 4

    Data

    Order

    Number

    Assign Midpoint to Ties

    Percentile Rank (Apply Formula)

    9

    1

    1

    1

    2.381

    5

    2

    2

    2

    7.143

    2

    3

    3

    4

    16.667

    3

    3

    4

    4

    16.667

    3

    3

    5

    4

    16.667

    4

    4

    6

    7

    30.952

    8

    4

    7

    7

    30.952

    9

    4

    8

    7

    30.952

    1

    5

    9

    10

    45.238

    7

    5

    10

    10

    45.238

    4

    5

    11

    10

    45.238

    8

    6

    12

    12

    54.762

    3

    7

    13

    14

    64.286

    7

    7

    14

    14

    64.286

    6

    7

    15

    14

    64.286

    5

    8

    16

    17.5

    80.952

    7

    8

    17

    17.5

    80.952

    4

    8

    18

    17.5

    80.952

    5

    8

    19

    17.5

    80.952

    8

    9

    20

    20.5

    95.238

    8

    9

    21

    20.5

    95.238

  • Psy 427 - Cal State Northridge*PercentileWhere XP is the score at the desired percentile, p is the desired percentile (a number between 0 and 1) and n is the number of scores)If the number is an integer, than the desired percentile is that numberIf the number is not an integer than you can either round or interpolate; for this class well just round (round up when p is below .50 and down when p is above .50)

    Psy 427 - Cal State Northridge

  • PercentileApply the formulaYoull get a number like 7.5 (think of it as place1.proportion)Start with the value indicated by place1 (e.g. 7.5, start with the value in the 7th place)Find place2 which is the next highest place number (e.g. the 8th place) and subtract the value in place1 from the value in place2, this distance1Multiple the proportion number by the distance1 value, this is distance2Add distance2 to the value in place1 and that is the interpolated valuePsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Example: PercentileExample 1: 25th percentile: {1, 4, 9, 16, 25, 36, 49, 64, 81}X25 = (.25)(9+1) = 2.5place1 = 2, proportion = .5Value in place1 = 4Value in place2 = 9distance1 = 9 4 = 5distance2 = 5 * .5 = 2.5Interpolated value = 4 + 2.5 = 6.56.5 is the 25th percentilePsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Example: PercentileExample 2: 75th percentile {1, 4, 9, 16, 25, 36, 49, 64, 81}X75 = (.75)(9+1) = 7.5place1 = 7, proportion = .5Value in place1 = 49Value in place2 = 64distance1 = 64 49 = 15distance2 = 15 * .5 = 7.5Interpolated value = 49 + 7.5 = 56.556.5 is the 75th percentilePsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • QuartilesTo calculate Quartiles you simply find the scores the correspond to the 25, 50 and 75 percentiles. Q1 = P25, Q2 = P50, Q3 = P75Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Reducing DistributionsRegardless of numbers of scores, distributions can be described with three pieces of info:Central TendencyVariabilityShape (Normal, Skewed, etc.)

    Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Measures of Central TendencyPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Sheet1

    ScoreScore - Meandi=(Xi MX)

    33 - 5.75-2.75

    44 - 5.75-1.75

    66 - 5.750.25

    1010 - 5.754.25

    0

    Sheet2

    MeasureDefinitionLevel of MeasurementDisadvantage

    ModeMost frequent valuenom., ord., int./rat.Crude

    MedianMiddle valueord., int./rat.Only two points contribute

    MeanArithmetic averageint./rat.Affected by skew

    Sheet3

  • The MeanOnly used for interval & ratio data.

    Major advantages:The sample value is a very good estimate of the population value.Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Reducing DistributionsRegardless of numbers of scores, distributions can be described with three pieces of info:Central TendencyVariabilityShape (Normal, Skewed, etc.)

    Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • How do scores spread out?VariabilityTell us how far scores spread outTells us how the degree to which scores deviate from the central tendencyPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • How are these different?Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Chart1

    0.000145441

    0.000154156

    0.0001633479

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    0.0001940211

    0.0002053617

    0.0002173048

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    0.0003202879

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    0.0009920597

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    0.0014474571

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    Sheet1

    -110.000145441

    -10.90.000154156Mean10

    -10.80.0001633479SD6

    -10.70.0001730398Variance36

    -10.60.0001832558

    -10.50.0001940211

    -10.40.00020536170.0664903023

    -10.30.000217304824163379722533400

    -10.20.0002298786

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    560

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    570

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    580

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    590

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    59.80

    59.90

    600

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    60.80

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    610

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    61.40

    61.50

    61.60

    61.70

    61.80

    61.90

    620

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    62.60

    62.70

    62.80

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    630

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    63.20

    63.30

    63.40

    63.50

    63.60

    63.70

    63.80

    63.90

    640

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    64.20

    64.30

    64.40

    64.50

    64.60

    64.70

    64.80

    64.90

    650

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    65.20

    65.30

    65.40

    65.50

    65.60

    65.70

    65.80

    65.90

    660

    66.10

    66.20

    66.30

    66.40

    66.50

    66.60

    66.70

    66.80

    66.90

    670

    67.10

    67.20

    67.30

    67.40

    67.50

    67.60

    67.70

    67.80

    67.90

    680

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    68.20

    68.30

    68.40

    68.50

    68.60

    68.70

    68.80

    68.90

    690

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    69.20

    69.30

    69.40

    69.50

    69.60

    69.70

    69.80

    69.90

    700

    70.10

    70.20

    70.30

    70.40

    70.50

    70.60

    70.70

    70.80

    70.90

    710

    71.10

    71.20

    71.30

    71.40

    71.50

    71.60

    71.70

    71.80

    71.90

    720

    72.10

    72.20

    72.30

    72.40

    72.50

    72.60

    72.70

    72.80

    72.90

    730

    73.10

    73.20

    73.30

    73.40

    73.50

    73.60

    73.70

    73.80

    73.90

    740

    74.10

    74.20

    74.30

    74.40

    74.50

    74.60

    74.70

    74.80

    74.90

    750

    75.10

    75.20

    75.30

    75.40

    75.50

    75.60

    75.70

    75.80

    75.90

    760

    76.10

    76.20

    76.30

    76.40

    76.50

    76.60

    76.70

    76.80

    76.90

    770

    77.10

    77.20

    77.30

    77.40

    77.50

    77.60

    77.70

    77.80

    77.90

    780

    78.10

    78.20

    78.30

    78.40

    78.50

    78.60

    78.70

    78.80

    78.90

    790

    79.10

    79.20

    79.30

    79.40

    79.50

    79.60

    79.70

    79.80

    79.90

    800

    80.10

    80.20

    80.30

    80.40

    80.50

    80.60

    80.70

    80.80

    80.90

    810

    81.10

    81.20

    81.30

    81.40

    81.50

    81.60

    81.70

    81.80

    81.90

    820

    82.10

    82.20

    82.30

    82.40

    82.50

    82.60

    82.70

    82.80

    82.90

    830

    83.10

    83.20

    83.30

    83.40

    83.50

    83.60

    83.70

    83.80

    83.90

    840

    84.10

    84.20

    84.30

    84.40

    84.50

    84.60

    84.70

    84.80

    84.90

    850

    85.10

    85.20

    85.30

    85.40

    85.50

    85.60

    85.70

    85.80

    85.90

    860

    86.10

    86.20

    86.30

    86.40

    86.50

    86.60

    86.70

    86.80

    86.90

    870

    87.10

    87.20

    87.30

    87.40

    87.50

    87.60

    87.70

    87.80

    87.90

    880

    88.10

    88.20

    88.30

    88.40

    88.50

    88.60

    88.70

    88.80

    88.90

    890

    89.10

    89.20

    89.30

    89.40

    89.50

    89.60

    89.70

    89.80

    89.90

    900

    90.10

    90.20

    90.30

    90.40

    90.50

    90.60

    90.70

    90.80

    90.90

    910

    91.10

    91.20

    91.30

    91.40

    91.50

    91.60

    91.70

    91.80

    91.90

    920

    92.10

    92.20

    92.30

    92.40

    92.50

    92.60

    92.70

    92.80

    92.90

    930

    93.10

    93.20

    93.30

    93.40

    93.50

    93.60

    93.70

    93.80

    93.90

    940

    94.10

    94.20

    94.30

    94.40

    94.50

    94.60

    94.70

    94.80

    94.90

    950

    95.10

    95.20

    95.30

    95.40

    95.50

    95.60

    95.70

    95.80

    95.90

    960

    96.10

    96.20

    96.30

    96.40

    96.50

    96.60

    96.70

    96.80

    96.90

    970

    97.10

    97.20

    97.30

    97.40

    97.50

    97.60

    97.70

    97.80

    97.90

    980

    98.10

    98.20

    98.30

    98.40

    98.50

    98.60

    98.70

    98.80

    98.90

    990

    99.10

    99.20

    99.30

    99.40

    99.50

    99.60

    99.70

    99.80

    99.90

    1000

    100.10

    100.20

    100.30

    100.40

    100.50

    100.60

    100.70

    100.80

    100.90

    1010

    101.10

    101.20

    101.30

    101.40

    101.50

    101.60

    101.70

    101.80

    101.90

    1020

    102.10

    102.20

    102.30

    102.40

    102.50

    102.60

    102.70

    102.80

    102.90

    1030

    103.10

    103.20

    103.30

    103.40

    103.50

    103.60

    103.70

    103.80

    103.90

    1040

    104.10

    104.20

    104.30

    104.40

    104.50

    104.60

    104.70

    104.80

    104.90

    1050

    105.10

    105.20

    105.30

    105.40

    105.50

    105.60

    105.70

    105.80

    105.90

    1060

    106.10

    106.20

    106.30

    106.40

    106.50

    106.60

    106.70

    106.80

    106.90

    1070

    107.10

    107.20

    107.30

    107.40

    107.50

    107.60

    107.70

    107.80

    107.90

    1080

    108.10

    108.20

    108.30

    108.40

    108.50

    108.60

    108.70

    108.80

    108.90

    1090

    109.10

    109.20

    109.30

    109.40

    109.50

    109.60

    109.70

    109.80

    109.90

    1100

    110.10

    110.20

    110.30

    110.40

    110.50

    110.60

    110.70

    110.80

    110.90

    1110

    111.10

    111.20

    111.30

    111.40

    111.50

    111.60

    111.70

    111.80

    111.90

    1120

    112.10

    112.20

    112.30

    112.40

    112.50

    112.60

    112.70

    112.80

    112.90

    1130

    113.10

    113.20

    113.30

    113.40

    113.50

    113.60

    113.70

    113.80

    113.90

    1140

    114.10

    114.20

    114.30

    114.40

    114.50

    114.60

    114.70

    114.80

    114.90

    1150

    115.10

    115.20

    115.30

    115.40

    115.50

    115.60

    115.70

    115.80

    115.90

    1160

    116.10

    116.20

    116.30

    116.40

    116.50

    116.60

    116.70

    116.80

    116.90

    1170

    117.10

    117.20

    117.30

    117.40

    117.50

    117.60

    117.70

    117.80

    117.90

    1180

    118.10

    118.20

    118.30

    118.40

    118.50

    118.60

    118.70

    118.80

    118.90

    1190

    119.10

    119.20

    119.30

    119.40

    119.50

    119.60

    119.70

    119.80

    119.90

    1200

    120.10

    120.20

    120.30

    120.40

    120.50

    120.60

    120.70

    120.80

    120.90

    1210

    121.10

    121.20

    121.30

    121.40

    121.50

    121.60

    121.70

    121.80

    121.90

    1220

    122.10

    122.20

    122.30

    122.40

    122.50

    122.60

    122.70

    122.80

    122.90

    1230

    123.10

    123.20

    123.30

    123.40

    123.50

    123.60

    123.70

    123.80

    123.90

    1240

    124.10

    124.20

    124.30

    124.40

    124.50

    124.60

    124.70

    124.80

    124.90

    1250

    125.10

    125.20

    125.30

    125.40

    125.50

    125.60

    125.70

    125.80

    125.90

    1260

    126.10

    126.20

    126.30

    126.40

    126.50

    126.60

    126.70

    126.80

    126.90

    1270

    127.10

    127.20

    127.30

    127.40

    127.50

    127.60

    127.70

    127.80

    127.90

    1280

    128.10

    128.20

    128.30

    128.40

    128.50

    128.60

    128.70

    128.80

    128.90

    1290

    129.10

    129.20

    129.30

    129.40

    129.50

    129.60

    129.70

    129.80

    129.90

    1300

    130.10

    130.20

    130.30

    130.40

    130.50

    130.60

    130.70

    130.80

    130.90

    1310

    131.10

    131.20

    131.30

    131.40

    131.50

    131.60

    131.70

    131.80

    131.90

    1320

    132.10

    132.20

    132.30

    132.40

    132.50

    132.60

    132.70

    132.80

    132.90

    1330

    133.10

    133.20

    133.30

    133.40

    133.50

    133.60

    133.70

    133.80

    133.90

    1340

    134.10

    134.20

    134.30

    134.40

    134.50

    134.60

    134.70

    134.80

    134.90

    1350

    135.10

    135.20

    135.30

    135.40

    135.50

    135.60

    135.70

    135.80

    135.90

    1360

    136.10

    136.20

    136.30

    136.40

    136.50

    136.60

    136.70

    136.80

    136.90

    1370

    137.10

    137.20

    137.30

    137.40

    137.50

    137.60

    137.70

    137.80

    137.90

    1380

    138.10

    138.20

    138.30

    138.40

    138.50

    138.60

    138.70

    138.80

    138.90

    1390

    139.10

    139.20

    139.30

    139.40

    139.50

    139.60

    139.70

    139.80

    139.90

    1400

    140.10

    140.20

    140.30

    140.40

    140.50

    140.60

    140.70

    140.80

    140.90

    1410

    141.10

    141.20

    141.30

    141.40

    141.50

    141.60

    141.70

    141.80

    141.90

    1420

    142.10

    142.20

    142.30

    142.40

    142.50

    142.60

    142.70

    142.80

    142.90

    1430

    143.10

    143.20

    143.30

    143.40

    143.50

    143.60

    143.70

    143.80

    143.90

    1440

    144.10

    144.20

    144.30

    144.40

    144.50

    144.60

    144.70

    144.80

    144.90

    1450

    145.10

    145.20

    145.30

    145.40

    145.50

    145.60

    145.70

    145.80

    145.90

    1460

    146.10

    146.20

    146.30

    146.40

    146.50

    146.60

    146.70

    146.80

    146.90

    1470

    147.10

    147.20

    147.30

    147.40

    147.50

    147.60

    147.70

    147.80

    147.90

    1480

    148.10

    148.20

    148.30

    148.40

    148.50

    148.60

    148.70

    148.80

    148.90

    1490

    149.10

    149.20

    149.30

    149.40

    149.50

    149.60

    149.70

    149.80

    149.90

    1500

    150.10

    150.20

    150.30

    150.40

    150.50

    150.60

    150.70

    150.80

    150.90

    1510

    151.10

    151.20

    151.30

    151.40

    151.50

    151.60

    151.70

    151.80

    151.90

    1520

    152.10

    152.20

    152.30

    152.40

    152.50

    152.60

    152.70

    152.80

    152.90

    1530

    153.10

    153.20

    153.30

    153.40

    153.50

    153.60

    153.70

    153.80

    153.90

    1540

    154.10

    154.20

    154.30

    154.40

    154.50

    154.60

    154.70

    154.80

    154.90

    1550

    155.10

    155.20

    155.30

    155.40

    155.50

    155.60

    155.70

    155.80

    155.90

    1560

    156.10

    156.20

    156.30

    156.40

    156.50

    156.60

    156.70

    156.80

    156.90

    1570

    157.10

    157.20

    157.30

    157.40

    157.50

    157.60

    157.70

    157.80

    157.90

    1580

    158.10

    158.20

    158.30

    158.40

    158.50

    158.60

    158.70

    158.80

    158.90

    1590

    159.10

    159.20

    159.30

    159.40

    159.50

    159.60

    159.70

    159.80

    159.90

    1600

    160.10

    160.20

    160.30

    160.40

    160.50

    160.60

    160.70

    160.80

    160.90

    1610

    161.10

    161.20

    161.30

    161.40

    161.50

    161.60

    161.70

    161.80

    161.90

    1620

    162.10

    162.20

    162.30

    162.40

    162.50

    162.60

    162.70

    162.80

    162.90

    1630

    163.10

    163.20

    163.30

    163.40

    163.50

    163.60

    163.70

    163.80

    163.90

    1640

    164.10

    164.20

    164.30

    164.40

    164.50

    164.60

    164.70

    164.80

    164.90

    1650

    165.10

    165.20

    165.30

    165.40

    165.50

    165.60

    165.70

    165.80

    165.90

    1660

    166.10

    166.20

    166.30

    166.40

    166.50

    166.60

    166.70

    166.80

    166.90

    1670

    167.10

    167.20

    167.30

    167.40

    167.50

    167.60

    167.70

    167.80

    167.90

    1680

    168.10

    168.20

    168.30

    168.40

    168.50

    168.60

    168.70

    168.80

    168.90

    1690

    169.10

    169.20

    169.30

    169.40

    169.50

    169.60

    169.70

    169.80

    169.90

    1700

    170.10

    170.20

    170.30

    170.40

    170.50

    170.60

    170.70

    170.80

    170.90

    1710

    171.10

    171.20

    171.30

    171.40

    171.50

    171.60

    171.70

    171.80

    171.90

    1720

    172.10

    172.20

    172.30

    172.40

    172.50

    172.60

    172.70

    172.80

    172.90

    1730

    173.10

    173.20

    173.30

    173.40

    173.50

    173.60

    173.70

    173.80

    173.90

    1740

    174.10

    174.20

    174.30

    174.40

    174.50

    174.60

    174.70

    174.80

    174.90

    1750

    175.10

    175.20

    175.30

    175.40

    175.50

    175.60

    175.70

    175.80

    175.90

    1760

    176.10

    176.20

    176.30

    176.40

    176.50

    176.60

    176.70

    176.80

    176.90

    1770

    177.10

    177.20

    177.30

    177.40

    177.50

    177.60

    177.70

    177.80

    177.90

    1780

    178.10

    178.20

    178.30

    178.40

    178.50

    178.60

    178.70

    178.80

    178.90

    1790

    179.10

    179.20

    179.30

    179.40

    179.50

    179.60

    179.70

    179.80

    179.90

    1800

    180.10

    180.20

    180.30

    180.40

    180.50

    180.60

    180.70

    180.80

    180.90

    1810

    181.10

    181.20

    181.30

    181.40

    181.50

    181.60

    181.70

    181.80

    181.90

    1820

    182.10

    182.20

    182.30

    182.40

    182.50

    182.60

    182.70

    182.80

    182.90

    1830

    183.10

    183.20

    183.30

    183.40

    183.50

    183.60

    183.70

    183.80

    183.90

    1840

    184.10

    184.20

    184.30

    184.40

    184.50

    184.60

    184.70

    184.80

    184.90

    1850

    185.10

    185.20

    185.30

    185.40

    185.50

    185.60

    185.70

    185.80

    185.90

    1860

    186.10

    186.20

    186.30

    186.40

    186.50

    186.60

    186.70

    186.80

    186.90

    1870

    187.10

    187.20

    187.30

    187.40

    187.50

    187.60

    187.70

    187.80

    187.90

    1880

    188.10

    188.20

    188.30

    188.40

    188.50

    188.60

    188.70

    188.80

    188.90

    1890

    Sheet1

    Sheet2

    Sheet3

    Chart2

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    750

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    75.20

    75.30

    75.40

    75.50

    75.60

    75.70

    75.80

    75.90

    760

    76.10

    76.20

    76.30

    76.40

    76.50

    76.60

    76.70

    76.80

    76.90

    770

    77.10

    77.20

    77.30

    77.40

    77.50

    77.60

    77.70

    77.80

    77.90

    780

    78.10

    78.20

    78.30

    78.40

    78.50

    78.60

    78.70

    78.80

    78.90

    790

    79.10

    79.20

    79.30

    79.40

    79.50

    79.60

    79.70

    79.80

    79.90

    800

    80.10

    80.20

    80.30

    80.40

    80.50

    80.60

    80.70

    80.80

    80.90

    810

    81.10

    81.20

    81.30

    81.40

    81.50

    81.60

    81.70

    81.80

    81.90

    820

    82.10

    82.20

    82.30

    82.40

    82.50

    82.60

    82.70

    82.80

    82.90

    830

    83.10

    83.20

    83.30

    83.40

    83.50

    83.60

    83.70

    83.80

    83.90

    840

    84.10

    84.20

    84.30

    84.40

    84.50

    84.60

    84.70

    84.80

    84.90

    850

    85.10

    85.20

    85.30

    85.40

    85.50

    85.60

    85.70

    85.80

    85.90

    860

    86.10

    86.20

    86.30

    86.40

    86.50

    86.60

    86.70

    86.80

    86.90

    870

    87.10

    87.20

    87.30

    87.40

    87.50

    87.60

    87.70

    87.80

    87.90

    880

    88.10

    88.20

    88.30

    88.40

    88.50

    88.60

    88.70

    88.80

    88.90

    890

    89.10

    89.20

    89.30

    89.40

    89.50

    89.60

    89.70

    89.80

    89.90

    900

    90.10

    90.20

    90.30

    90.40

    90.50

    90.60

    90.70

    90.80

    90.90

    910

    91.10

    91.20

    91.30

    91.40

    91.50

    91.60

    91.70

    91.80

    91.90

    920

    92.10

    92.20

    92.30

    92.40

    92.50

    92.60

    92.70

    92.80

    92.90

    930

    93.10

    93.20

    93.30

    93.40

    93.50

    93.60

    93.70

    93.80

    93.90

    940

    94.10

    94.20

    94.30

    94.40

    94.50

    94.60

    94.70

    94.80

    94.90

    950

    95.10

    95.20

    95.30

    95.40

    95.50

    95.60

    95.70

    95.80

    95.90

    960

    96.10

    96.20

    96.30

    96.40

    96.50

    96.60

    96.70

    96.80

    96.90

    970

    97.10

    97.20

    97.30

    97.40

    97.50

    97.60

    97.70

    97.80

    97.90

    980

    98.10

    98.20

    98.30

    98.40

    98.50

    98.60

    98.70

    98.80

    98.90

    990

    99.10

    99.20

    99.30

    99.40

    99.50

    99.60

    99.70

    99.80

    99.90

    1000

    100.10

    100.20

    100.30

    100.40

    100.50

    100.60

    100.70

    100.80

    100.90

    1010

    101.10

    101.20

    101.30

    101.40

    101.50

    101.60

    101.70

    101.80

    101.90

    1020

    102.10

    102.20

    102.30

    102.40

    102.50

    102.60

    102.70

    102.80

    102.90

    1030

    103.10

    103.20

    103.30

    103.40

    103.50

    103.60

    103.70

    103.80

    103.90

    1040

    104.10

    104.20

    104.30

    104.40

    104.50

    104.60

    104.70

    104.80

    104.90

    1050

    105.10

    105.20

    105.30

    105.40

    105.50

    105.60

    105.70

    105.80

    105.90

    1060

    106.10

    106.20

    106.30

    106.40

    106.50

    106.60

    106.70

    106.80

    106.90

    1070

    107.10

    107.20

    107.30

    107.40

    107.50

    107.60

    107.70

    107.80

    107.90

    1080

    108.10

    108.20

    108.30

    108.40

    108.50

    108.60

    108.70

    108.80

    108.90

    1090

    109.10

    109.20

    109.30

    109.40

    109.50

    109.60

    109.70

    109.80

    109.90

    1100

    110.10

    110.20

    110.30

    110.40

    110.50

    110.60

    110.70

    110.80

    110.90

    1110

    111.10

    111.20

    111.30

    111.40

    111.50

    111.60

    111.70

    111.80

    111.90

    1120

    112.10

    112.20

    112.30

    112.40

    112.50

    112.60

    112.70

    112.80

    112.90

    1130

    113.10

    113.20

    113.30

    113.40

    113.50

    113.60

    113.70

    113.80

    113.90

    1140

    114.10

    114.20

    114.30

    114.40

    114.50

    114.60

    114.70

    114.80

    114.90

    1150

    115.10

    115.20

    115.30

    115.40

    115.50

    115.60

    115.70

    115.80

    115.90

    1160

    116.10

    116.20

    116.30

    116.40

    116.50

    116.60

    116.70

    116.80

    116.90

    1170

    117.10

    117.20

    117.30

    117.40

    117.50

    117.60

    117.70

    117.80

    117.90

    1180

    118.10

    118.20

    118.30

    118.40

    118.50

    118.60

    118.70

    118.80

    118.90

    1190

    119.10

    119.20

    119.30

    119.40

    119.50

    119.60

    119.70

    119.80

    119.90

    1200

    120.10

    120.20

    120.30

    120.40

    120.50

    120.60

    120.70

    120.80

    120.90

    1210

    121.10

    121.20

    121.30

    121.40

    121.50

    121.60

    121.70

    121.80

    121.90

    1220

    122.10

    122.20

    122.30

    122.40

    122.50

    122.60

    122.70

    122.80

    122.90

    1230

    123.10

    123.20

    123.30

    123.40

    123.50

    123.60

    123.70

    123.80

    123.90

    1240

    124.10

    124.20

    124.30

    124.40

    124.50

    124.60

    124.70

    124.80

    124.90

    1250

    125.10

    125.20

    125.30

    125.40

    125.50

    125.60

    125.70

    125.80

    125.90

    1260

    126.10

    126.20

    126.30

    126.40

    126.50

    126.60

    126.70

    126.80

    126.90

    1270

    127.10

    127.20

    127.30

    127.40

    127.50

    127.60

    127.70

    127.80

    127.90

    1280

    128.10

    128.20

    128.30

    128.40

    128.50

    128.60

    128.70

    128.80

    128.90

    1290

    129.10

    129.20

    129.30

    129.40

    129.50

    129.60

    129.70

    129.80

    129.90

    1300

    130.10

    130.20

    130.30

    130.40

    130.50

    130.60

    130.70

    130.80

    130.90

    1310

    131.10

    131.20

    131.30

    131.40

    131.50

    131.60

    131.70

    131.80

    131.90

    1320

    132.10

    132.20

    132.30

    132.40

    132.50

    132.60

    132.70

    132.80

    132.90

    1330

    133.10

    133.20

    133.30

    133.40

    133.50

    133.60

    133.70

    133.80

    133.90

    1340

    134.10

    134.20

    134.30

    134.40

    134.50

    134.60

    134.70

    134.80

    134.90

    1350

    135.10

    135.20

    135.30

    135.40

    135.50

    135.60

    135.70

    135.80

    135.90

    1360

    136.10

    136.20

    136.30

    136.40

    136.50

    136.60

    136.70

    136.80

    136.90

    1370

    137.10

    137.20

    137.30

    137.40

    137.50

    137.60

    137.70

    137.80

    137.90

    1380

    138.10

    138.20

    138.30

    138.40

    138.50

    138.60

    138.70

    138.80

    138.90

    1390

    139.10

    139.20

    139.30

    139.40

    139.50

    139.60

    139.70

    139.80

    139.90

    1400

    140.10

    140.20

    140.30

    140.40

    140.50

    140.60

    140.70

    140.80

    140.90

    1410

    141.10

    141.20

    141.30

    141.40

    141.50

    141.60

    141.70

    141.80

    141.90

    1420

    142.10

    142.20

    142.30

    142.40

    142.50

    142.60

    142.70

    142.80

    142.90

    1430

    143.10

    143.20

    143.30

    143.40

    143.50

    143.60

    143.70

    143.80

    143.90

    1440

    144.10

    144.20

    144.30

    144.40

    144.50

    144.60

    144.70

    144.80

    144.90

    1450

    145.10

    145.20

    145.30

    145.40

    145.50

    145.60

    145.70

    145.80

    145.90

    1460

    146.10

    146.20

    146.30

    146.40

    146.50

    146.60

    146.70

    146.80

    146.90

    1470

    147.10

    147.20

    147.30

    147.40

    147.50

    147.60

    147.70

    147.80

    147.90

    1480

    148.10

    148.20

    148.30

    148.40

    148.50

    148.60

    148.70

    148.80

    148.90

    1490

    149.10

    149.20

    149.30

    149.40

    149.50

    149.60

    149.70

    149.80

    149.90

    1500

    150.10

    150.20

    150.30

    150.40

    150.50

    150.60

    150.70

    150.80

    150.90

    1510

    151.10

    151.20

    151.30

    151.40

    151.50

    151.60

    151.70

    151.80

    151.90

    1520

    152.10

    152.20

    152.30

    152.40

    152.50

    152.60

    152.70

    152.80

    152.90

    1530

    153.10

    153.20

    153.30

    153.40

    153.50

    153.60

    153.70

    153.80

    153.90

    1540

    154.10

    154.20

    154.30

    154.40

    154.50

    154.60

    154.70

    154.80

    154.90

    1550

    155.10

    155.20

    155.30

    155.40

    155.50

    155.60

    155.70

    155.80

    155.90

    1560

    156.10

    156.20

    156.30

    156.40

    156.50

    156.60

    156.70

    156.80

    156.90

    1570

    157.10

    157.20

    157.30

    157.40

    157.50

    157.60

    157.70

    157.80

    157.90

    1580

    158.10

    158.20

    158.30

    158.40

    158.50

    158.60

    158.70

    158.80

    158.90

    1590

    159.10

    159.20

    159.30

    159.40

    159.50

    159.60

    159.70

    159.80

    159.90

    1600

    160.10

    160.20

    160.30

    160.40

    160.50

    160.60

    160.70

    160.80

    160.90

    1610

    161.10

    161.20

    161.30

    161.40

    161.50

    161.60

    161.70

    161.80

    161.90

    1620

    162.10

    162.20

    162.30

    162.40

    162.50

    162.60

    162.70

    162.80

    162.90

    1630

    163.10

    163.20

    163.30

    163.40

    163.50

    163.60

    163.70

    163.80

    163.90

    1640

    164.10

    164.20

    164.30

    164.40

    164.50

    164.60

    164.70

    164.80

    164.90

    1650

    165.10

    165.20

    165.30

    165.40

    165.50

    165.60

    165.70

    165.80

    165.90

    1660

    166.10

    166.20

    166.30

    166.40

    166.50

    166.60

    166.70

    166.80

    166.90

    1670

    167.10

    167.20

    167.30

    167.40

    167.50

    167.60

    167.70

    167.80

    167.90

    1680

    168.10

    168.20

    168.30

    168.40

    168.50

    168.60

    168.70

    168.80

    168.90

    1690

    169.10

    169.20

    169.30

    169.40

    169.50

    169.60

    169.70

    169.80

    169.90

    1700

    170.10

    170.20

    170.30

    170.40

    170.50

    170.60

    170.70

    170.80

    170.90

    1710

    171.10

    171.20

    171.30

    171.40

    171.50

    171.60

    171.70

    171.80

    171.90

    1720

    172.10

    172.20

    172.30

    172.40

    172.50

    172.60

    172.70

    172.80

    172.90

    1730

    173.10

    173.20

    173.30

    173.40

    173.50

    173.60

    173.70

    173.80

    173.90

    1740

    174.10

    174.20

    174.30

    174.40

    174.50

    174.60

    174.70

    174.80

    174.90

    1750

    175.10

    175.20

    175.30

    175.40

    175.50

    175.60

    175.70

    175.80

    175.90

    1760

    176.10

    176.20

    176.30

    176.40

    176.50

    176.60

    176.70

    176.80

    176.90

    1770

    177.10

    177.20

    177.30

    177.40

    177.50

    177.60

    177.70

    177.80

    177.90

    1780

    178.10

    178.20

    178.30

    178.40

    178.50

    178.60

    178.70

    178.80

    178.90

    1790

    179.10

    179.20

    179.30

    179.40

    179.50

    179.60

    179.70

    179.80

    179.90

    1800

    180.10

    180.20

    180.30

    180.40

    180.50

    180.60

    180.70

    180.80

    180.90

    1810

    181.10

    181.20

    181.30

    181.40

    181.50

    181.60

    181.70

    181.80

    181.90

    1820

    182.10

    182.20

    182.30

    182.40

    182.50

    182.60

    182.70

    182.80

    182.90

    1830

    183.10

    183.20

    183.30

    183.40

    183.50

    183.60

    183.70

    183.80

    183.90

    1840

    184.10

    184.20

    184.30

    184.40

    184.50

    184.60

    184.70

    184.80

    184.90

    1850

    185.10

    185.20

    185.30

    185.40

    185.50

    185.60

    185.70

    185.80

    185.90

    1860

    186.10

    186.20

    186.30

    186.40

    186.50

    186.60

    186.70

    186.80

    186.90

    1870

    187.10

    187.20

    187.30

    187.40

    187.50

    187.60

    187.70

    187.80

    187.90

    1880

    188.10

    188.20

    188.30

    188.40

    188.50

    188.60

    188.70

    188.80

    188.90

    1890

    Sheet1

    Sheet2

    Sheet3

  • Measure of VariabilityPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

    Measure

    Definition

    Related to:

    Range

    Largest - Smallest

    Mode

    Interquartile Range

    X75 - X25

    Median

    Semi-Interquartile Range

    (X75 - X25)/2

    Average Absolute Deviation

    Mean

    Variance

    Standard Deviation

    _1220299450.unknown

    _1220299451.unknown

    _1220298261.unknown

  • The RangeThe simplest measure of variability Range (R) = Xhighest XlowestAdvantage Easy to CalculateDisadvantagesLike Median, only dependent on two scores unstable {0, 8, 9, 9, 11, 53} Range = 53 {0, 8, 9, 9, 11, 11} Range = 11Does not reflect all scoresPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Variability: IQRInterquartile Range = P75 P25 or Q3 Q1This helps to get a range that is not influenced by the extreme high and low scoresWhere the range is the spread across 100% of the scores, the IQR is the spread across the middle 50%Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Variability: SIQRSemi-interquartile range=(P75 P25)/2 or (Q3 Q1)/2IQR/2This is the spread of the middle 25% of the dataThe average distance of Q1 and Q3 from the medianBetter for skewed dataPsy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • Variability: SIQRSemi-Interquartile rangePsy 427 - Cal State Northridge*Q1 Q2 Q3Q1 Q2 Q3

    Psy 427 - Cal State Northridge

  • VarianceThe average squared distance of each score from the meanAlso known as the mean squareVariance of a sample: s2Variance of a population: s2Psy 427 - Cal State Northridge*

    Psy 427 - Cal State Northridge

  • VariancePsy 427 - Cal State Northridge*When calculated for a sample

    When calculated for the entire population

    Psy 427 - Cal State No