quiz 1 student version
TRANSCRIPT
QUIZ 1
Page 1
CHAPTER 1
1. If a variable has possible values –2, 6, and 17, then this variable is
A) both a continuous and a discrete variable
B) a continuous variable
C) neither a continuous nor a discrete variable
D) a discrete variable
2. Based on the following graph, what conclusion could you make comparing how well
students did on their statistics exam as a function of how many hours they spent preparing
for the exam?
A) Hours spent preparing for an exam is a dependent variable.
B) There is no relationship between the number of hours spent preparing for the exam
and the average grade.
C) There is a possible relationship between grades and time spent preparing for the
exam.
D) Grades are independent of preparation time.
3. If a researcher manipulates one of the variables and tries to determine how the
manipulation influences other variables, the researcher is conducting a(n)
A) manipulative study. C) observational study.
B) independent study. D) experimental study.
4. Which of the following correctly describes the relationship between a sample and a
population?
A) A population and a sample are not related.
B) A sample is a group of subjects selected from a population to be studied.
C) A sample is a group of populations that are subject to observation.
D) A population is a group of samples that may or may not be included in a study.
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5. In a true experimental study, the subjects should be assigned to groups randomly. If this is
not possible and a researcher uses intact groups, they are performing a
A) stratified study. C) quasi-experimental study.
B) cluster study. D) convoluted study.
6. If you were told that four students from a class of twenty were questioned for a grade
versus test preparation poll, this would be an example of
A) organizing. B) sampling. C) surveying. D) interviewing.
7. What is the term for a characteristic or attribute that can assume different values?
A) exponent B) datum C) sample D) variable
8. Variables with values that are determined by chance are called
A) inconsistent variables. C) specialized.
B) random variables. D) erratic variables.
9. If you classified the fruit in a basket as apple, orange, or banana, this would be an example
of which level of measurement?
A) ordinal B) ratio C) nominal D) interval
10. If a weather center monitors and calculates the average number of tornadoes that pass
through Topeka, Kansas each year, what type of variable would they be investigating?
A) controlled variable C) random variable
B) weather variable D) isolated variable
11. Each value in a data set may be referred to as either a data value or a(n)
A) atom. B) data subset. C) data point. D) datum.
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12. A television station interviews five movie viewers after the first showing of a movie.
After finding out that all five enjoyed the movie very much, the reporter states that this
movie will definitely be a big hit. This is an example of
A) detached statistics C) changing the subject
B) ambiguous averages D) suspect samples
13. A variable measuring the number of people in a group
A) Can only be analyzed as a discrete variable
B) Could be analyzed as either continuous or discrete depending on the whether there
are a large or small number of people in the group
C) Cannot be analyzed as either continuous or discrete
D) Can only be analyzed as a continuous variable
14. The amount of time needed to run the Boston marathon is an example of which type of
variable?
A) continuous B) discrete C) qualitative D) none of the above
15. An advertisement for a car states that it is 10% more powerful than it's competitor. This is
an example of
A) ambiguous averages C) changing the subject
B) suspect samples D) detached statistics
16. An ad for an exercise product states: "Using this product will burn 74% more calories."
This is an example of
A) ambiguous averages C) changing the subject
B) suspect samples D) detached statistics
17. What type of sampling is being employed if the country is divided into economic classes
and a sample is chosen from each class to be surveyed?
A) cluster sampling C) systematic sampling
B) random sampling D) stratified sampling
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18. What level of measurement classifies data into mutually exclusive (nonoverlapping),
exhausting categories in which no order or ranking can be imposed on the data?
A) ordinal B) ratio C) nominal D) interval
19. Which of the following best defines the relationship between confounding, dependent,
and independent variables?
A) The confounding variable may cause the dependent variable to act independently.
B) The confounding variable influences the dependent variable, but cannot be separated
from the independent variable.
C) The confounding variable cannot be separated from the dependent variable.
D) The confounding variable influences the independent variable, but has no effect on
the dependent variable.
20. A magazine tests a new car and reports that it could be twice as fun to drive as it's
predecessor. This is NOT an example of
A) suspect samples C) implied connections
B) changing the subject D) detached statistics
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CHAPTER 2
1. Find the class with the least number of data values.
A) 70 B) 90 C) 60 D) 40
2. Thirty students recorded the colors of their eyes, choosing from the colors brown, blue,
green, hazel, and black. This data can be appropriately summarized in a
A) Open-ended distribution C) Grouped frequency distribution
B) Categorical frequency distribution D) Upper boundary
3. A Pareto chart does not have which of the following properties?
A) It is a bar chart
B) The frequencies are arranged from highest to lowest
C) The frequencies are arranged from lowest to highest
D) It is used to represent categorical data
4. A time series graph is useful for which of the following purposes?
A) Representing relative frequencies of categories in a specific year
B) Representing the cumulative frequencies of the data in a specific year
C) Representing the frequencies of the data, sorted from largest to smallest
D) Representing the frequencies of a data category over a period of several years
5. The graphs that have their distributions as proportions instead of raw data as frequencies
are called
A) relative frequency graphs. C) histograms.
B) ogive graphs. D) frequency polygons.
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6. The total frequency of the data whose ogive shown below
is approximately
A) 12 B) 18 C) 34 D) 90
7. What are the boundaries of the class 1.87–3.43?
A) 1.9–3.4 B) 1.87–3.43 C) 1.879–3.439 D) 1.865–3.435
8. The total frequency of the data whose histogram is shown below
is approximately
A) 11 B) 20 C) 50 D) 100
9. An automobile dealer wants to construct a pie graph to represent types of cars sold in July.
He sold 72 cars; 16 of which were convertibles. The convertibles will represent how
many degrees in the circle?
A) 60° B) 80° C) 100° D) 50°
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10. A scatter plot would be useful for
A) Showing the relative number of sales of four different brands of blank DVDs
B) Showing the trend of sales, over time, of five different brands of blank DVDs
C) Showing the relationship between the sales of blank CDs and blank DVDs
D) Showing the top selling brands of blank DVDs
11. What kind of relationship does the scatter plot show between x and y?
A) A positive linear relationship
B) A negative linear relationship
C) No linear relationship
D) This is not a scatter plot
12. Exaggerating a one-dimensional increase by showing it in two dimensions is an example
of a(n)
A) pictograph. B) pie graph. C) ogive. D) misleading graph.
13. A weatherman records the amount of rain that has fallen in Portland, Oregon during each
day. What type of graph should he use?
A) pie graph B) pictograph C) time series graph D) ogive
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14. Which of the following could be a cumulative frequency graph?
A)
B)
C)
D)
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15. Which of the following graphs is the scatter plot for the data given below?
x values 9 9 12 5 1
y values 4 2 9 6 6
A)
B)
C)
D)
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16. Which of the following is a frequency polygon?
A)
B)
C)
D)
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17. What type of graph is the figure below?
A) Pareto chart B) pictograph C) ogive D) pie graph
18. In a pie graph, if pepperoni pizza were 24/72 of the distribution, how many degrees would
be needed to represent pepperoni?
A) 90° B) 120° C) 60° D) 150°
19. Karen is constructing a pie graph to represent the number of hours her classmates do
homework each day. She found that 8/24 did homework for three hours each day. In her
pie graph, this would represent how many degrees?
A) 135° B) 45° C) 120° D) 240°
20. What is the midpoint of the class 1-17?
A) 1 B) 9 C) 1 and 17 D) 9 and 16
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CHAPTER 3
1. If the mean of a set of data is 23.00, and 12.60 has a z-score of –1.30, then the standard
deviation must be:
A) 4.00 B) 32.00 C) 64.00 D) 8.00
2. What is the median of the following numbers?
3, 5, 8, 10, 14
A) 9 B) 5 C) 7 D) 8
3. Find the z score for each student and indicate which one is higher.
Art Major X = 46 X = 50 s = 5
Theater Major X = 70 X = 75 s = 7 A) Both students have the same score.
B) Neither student received a positive score; therefore, the higher score cannot be
determined.
C) The theater major has a higher score than the art major.
D) The art major has a higher score than the theater major.
4. Which of the following is the correct mean for the given data?
7, 8, 13, 9, 10, 11
A) 9.7 B) 9.67 C) 9 D) 10
5. The minimum of the set of numbers {–3, 17, 3, 11, 5} is
A) 20 B) 10 C) –3 D) 17
6. The maximum of the set of numbers {8, 18, -5, 11, 5} is
A) 15 B) -5 C) 18 D) 10.5
7. If the mean of a set of data is 23.00, and 30.50 has a z-score of 0.75, then the standard
deviation must be:
A) 100.00 B) 5.00 C) 50.00 D) 10.00
8. If the five number summary for a set of data is 0, 3, 6, 7, and 16, then the mean of this set
of data is
A) 6 B) there is insufficient information to calculate the mean C) 8 D) 5
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9. Find Q1, Q2, and Q3 for the following data set.
7, 21, 32, 38.
A) Q1 5=
, Q2 20=
, and Q3 39= C) Q1 14=
, Q2 25=
, and Q3 25=
B) Q1 14=
, Q2 26 5= .
, and Q3 35= D) Q1 10=
, Q2 25=
, and Q3 36=
10. Find the median for the following data.
6, 7, 4, 5, 3, 7, 4
A) 5 B) 3 C) 7 D) 4
11. All the values in a dataset are between 9 and 11, except for one value of 84. That value 84
is likely to be
A) the boxplot B) the mean C) the range D) an outlier
12. A student received the following grades: An A in Statistics (4 credits), a D in Physics II (5
credits), a B in Sociology (3 credits), a B in a Literature seminar (2 credits), and a D in
Tennis (1 credit). Assuming A = 4 grade points, B = 3 grade points, C = 2 grade points, D
= 1 grade point, and F = 0 grade points, the student's grade point average is:
A) 2.47 B) 2.24 C) 2.52 D) 2.40
13. Given that the variance for a data set is 1.20, what would be the standard deviation?
A) 0.60 B) 1.20 C) 1.10 D) 1.44
14. In a unimodal, symmetrical distribution as shown in the figure below.
A) The median and the mode are the same, but the mean can be different.
B) The mean is the same as the median, but the mode can be different.
C) The mean, the median, and the mode are different.
D) The mean, the median, and the mode are the same.
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15. If a set of 25 numbers has standard deviation 9, then it's variance is
A) 45.00 B) 16.20 C) 81.00 D) 1.80
16. Which of the following is true?
A) D P Q50 5 25= = B) D P Q5 50 2= =
C) D P Q50 5 2= =
D) D P Q5 5 5= =
17. Determine the range for this data: 4, 7, 3, 16, 5, 22, and 8.
A) 14 B) 19 C) 3 D) 4
18. What is the range of the numbers –6, 2, –8, 3, 11
A) 19 B) –6 C) 2 D) 3
19. The range of the set of numbers {8, 17, 3, 10, 5} is
A) 10 B) 14 C) 17 D) 3
20. What is the term for a characteristic or measure obtained by using all the data values for a
specific population?
A) mode B) statistic C) parameter D) variable
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CHAPTER 1 CHAPTER 2 CHAPTER 3
1. 1. 1.
2. 2. 2.
3. 3. 3.
4. 4. 4.
5. 5. 5.
6. 6. 6.
7. 7. 7.
8. 8. 8.
9. 9. 9.
10. 10. 10.
11. 11. 11.
12. 12. 12.
13. 13. 13.
14. 14. 14.
15. 15. 15.
16. 16. 16.
17. 17. 17.
18. 18. 18.
19. 19. 19.
20. 20. 20.