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Ms. Drake 7th grade Math
Measures of Central Tendency
Lesson 1Populations and Samples
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Measures of Central Tendency Vocabulary
Bar graphBox- and-Whisker PlotCircle GraphCumulative FrequencyDouble Bar GraphFirst QuartileFrequency Table
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Measures of Central Tendency Vocabulary
HistogramLine GraphLower ExtremeMeanMedianModeNegative CorrelationNo correlation
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Measures of Central Tendency Vocabulary
OutlierPopulationPositive correlationRandom SampleRangeSample
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Measures of Central Tendency Vocabulary
Scatter PlotSecond QuartileSectorStem-and-Leaf PlotThird QuartileUpper Extreme
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Chapter 1
Populations and SamplesPopulation: The entire group of objects or individuals considered for a survey
Samples: A part of the population
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All elementary
students make up a population.
Students from this particular
class are the sample.
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Examples
Population: All lionsSample: Lions in a game preserve.
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Example
Population: All customersSample: The customers who fill out a survey
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Identify the Population and Sample in Each Situation
The decoration committee asks 25 students about
their ideas for a 7th grade party.
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The population is the 7th grade. The
sample is the 25 students surveyed.
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Identify the population and the sample in this situation.
A disc jockey asks the first ten listeners who call in if they like the last song that was played.
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The population is all the listening public.The sample is the first ten listeners
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Identify the population and the sample in this situation.
Researchers poll every fifteenth voter after a local
election.
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The population is all the people who
voted. The sample is the fifteen voters that
were polled.
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Random Sampling
For a sample to be useful, it must represent the population.
A random sample gives every member of the population an equal chance of being chosen.
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The local grocery store wants to know if their customers are satisfied with their service.
.
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The manager surveys the customers that
he knows personally
Tell whether each sampling method is random:
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Tell whether each sampling method is random:
The manager surveys every tenth customer that
comes into the store on Friday morning.
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Tell whether each sampling method is random:
The manager puts the names of all customers in a
hat and surveys the customers whose names he
draws.
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Give a reason why each sampling method may not be random.
A reporter calls 100 people from the telephone book.
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A researcher questions all of the customers at one of several entrances to a
supermarket.
Give a reason why each sampling
method may not be random.
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A reporter surveys people who are using
an internet site
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Until next time, try to come up with some other
ways that you can use what you know about
populations and samples.