Name _______________________________________ Date __________________ Class __________________
Mod 12 Review
1.Which of these statements best describes a
biased sample?
A It is very small.
B It is not randomly chosen.
C It results in incorrect predictions.
D It does not accurately represent the
population.
2. In a survey about new bike paths, which
group is least likely to be a biased
sample?
A randomly-chosen voters
B randomly-chosen drivers
C randomly-chosen dog walkers
D randomly-chosen gym members
Use the dot plot for 3–6.
A shipping manager weighed a random
sample from a shipment of 90 boxes and
made the dot plot above.
3. Which range of weights has the greatest
number of boxes?
A 22–25
C 28–30
B 25–29
D 30–36
4. Which box plot shows the same data as
the dot plot?
A
B
C
D
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Name _______________________________________ Date __________________ Class __________________
5.Use the data to estimate the weight of all 90
boxes.
A 2,000 oz
C 3,000 oz
B 2,500 oz
D 3,500 oz
6. Which of these values is much easier to
see on the box plot than on the dot plot?
A range
B interquartile range
C minimum
D maximum
7. A town has about 35,000 registered
voters. A random sample of 500 people
finds that 125 are in favor of a new dog
park. How many people are likely to vote
for the dog park?
A 25
C 2,625
B 125
D 8,750
Use the data sets for 8 and 9.
Plant Heights (cm): Group 1
28, 28, 30, 35, 29, 23, 25, 38, 40, 30, 26, 20
Plant Heights (cm): Group 2
20, 22, 30, 25, 15, 20, 25, 45, 28, 40, 40, 20
8. Which is an accurate comparison?
A Group 2 has a greater mean and a
wider distribution of heights.
B Group 2 has a greater mean and a
narrower distribution of heights.
C Group 2 has a lesser mean and a
wider distribution of heights.
D Group 2 has a lesser mean and a
narrower distribution of heights.
9. Which compares the tallest plant in
Group 2 to the tallest plant in Group 1?
A 11.1% shorter
C 11.1% taller
B 12.5% shorter
D 12.5% taller
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Name ________________________________________ Date __________________ Class __________________
10. A principal wants to find out if her school needs
more bike racks. A survey is taken of 30
students who ride the bus. Why might the
sample be biased? Describe a sample that is
more representative of the entire school.
_______________________________________
_______________________________________
_______________________________________
Use the data set for 11–15.
Children’s Ages
7, 4, 7, 7, 2, 10, 12, 8, 7, 4
The data set shows the ages of a random
sample of children under 14 who live in an
apartment building.
11. Make a dot plot to display the data.
12. Make a box plot to display the data.
13. What is the range and the most common age?
_______________________________________
14. What is the median age?
_______________________________________
15. Is a child in this building whose age is under 14
more likely to be younger than
7 or older than 7?
_______________________________________
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Name ________________________________________ Date __________________ Class __________________
Use the data sets for 16–19.
High School Students
24, 45, 5, 12, 18, 20, 41, 33,
17, 25, 30, 15, 21, 37, 40
College Students
25, 6, 16, 24, 32, 5, 10, 8,
28, 45, 8, 36, 28, 22, 8
Random samples were taken of two groups.
Students were asked how many movies they
rented last year.
16. Make two box plots to display the data.
17. Compare the ranges, interquartile ranges, and
medians.
_______________________________________
_______________________________________ 
_______________________________________
18. What can you infer about the populations from
these samples?
_______________________________________
_______________________________________
19. The surveyors decide to increase the sample
sizes by 60%. How many students will be in
the new survey?
_______________________________________
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