Name _________________________________________________ Class _______________ Date _______________
Practice
14-1
Interpreting a Scatterplot
14-1
Interpreting a Scatterplot
1.What does the indicated point on
the scatter plot represent?
2.Which point on the scatter plot represents
a hamburger that has 28 grams of fat and
510 calories?
❍❍ A. Point C
❍❍ B. Point B
❍❍ C. Point D
❍❍ D. Point E
❍❍ E. Point A
3.The scatter plot shows the ages and sleep
times of eleven people. Use the scatter plot to
identify which of these statements is true.
1. There were five people over the age of
12 in the group.
2. Three people slept for exactly 8 hours.
3. Everyone in the group slept at least
eight hours.
❍❍ A. Statement 1
❍❍ B. Statement 3
❍❍ C. Statement 2
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Practice 14-1
1
Homework G
4.The scatter plot shows climate data
for ten cities on a certain day. Use
the scatter plot to identify which of
these statements is false.
1. The temperature was at least
22°C in four cities.
2. Three cities got exactly
12 millimeters of rain.
3. None of the cities got more
than 19 millimeters of rain.
❍❍ A. Statement 2
❍❍ B. Statement 1
❍❍ C. Statement 3
5.a)Writing What does the indicated
point on the scatter plot represent?
b) Explain why it is possible for two
storms to have the same duration
but produce different amounts of
rain.
6.Reasoning The scatter plot shows
information about eleven cars.
a) Use the scatter plot to identify
which of these statements is false.
Check all that apply.
1. Six of the cars weigh at least
2,975 pounds.
2. Four of the cars average no
more than 24 miles per gallon.
3. Each car averages at least
25 miles per gallon.
❑❑ A. Statement 1
❑❑ B. Statement 3
❑❑ C. Statement 2
b) For each statement that is false, explain how you could change it to make
it true.
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Practice 14-1
2
Homework G
7. Error Analysis On a quiz, Beck needed
to find the point on the scatter plot
that represents a bag that contains
4 books and weighs 3 pounds. He
incorrectly claimed that point F
represents that bag.
A
B
C
F
H
a) What is the correct point?
D
❍❍ A. Point D
E
❍❍ B. Point E
❍❍ C. Point C
G
❍❍ D. Point A
❍❍ E. Point B
❍❍ F. Point H
❍❍ G. Point G
b) What mistake might Beck have made?
❍❍ A. He found the correct first coordinate but the incorrect second
coordinate.
❍❍ B. He reversed the first and second coordinates.
❍❍ C. He found the correct second coordinate but the incorrect first
coordinate.
8. Dining Out The scatter plot shows the
amounts of money eleven groups of
people spent on dinner at a
restaurant.
a) Use the scatter plot to identify
which of these statements is true.
Check all that apply.
1. There were three groups of
4 people.
2. Five groups of people spent
at least $40 in all.
3. There were nine groups of
5 people or fewer.
❑❑ A. Statement 3
❑❑ B. Statement 1
❑❑ C. Statement 2
b) Explain why the restaurant’s owners might find the information in the true
statement(s) useful.
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Practice 14-1
3
Homework G
9. a) Multiple Representations Which point
on the scatter plot represents a
giraffe that is 13 1 feet tall?
2
❍❍ A. Point E
D
❍❍ B. Point A
❍❍ C. Point C
B
❍❍ D. Point B
E
C
A
❍❍ E. Point D
b) Give another description of that
point.
10. The scatter plot shows ten gymnasts’
scores in two events. Use the scatter
plot to identify which of these statements is true. Check all that apply.
1. Five of the vault scores were
7 or better.
2. Five of the balance beam scores
were less than 7.
3. There were three gymnasts
whose combined scores were no
more than 13.5.
4. There were eight gymnasts
whose combined scores were at
least 14.
5. There were four gymnasts who scored better on the vault than on the
balance beam.
❑❑ A. Statement 3
❑❑ D. Statement 5
❑❑ B. Statement 4
❑❑ E. Statement 2
❑❑ C. Statement 1
11. a) Challenge Find each point on the
scatter plot that represents a
city that is at least 2,400 miles
from the equator and whose
annual snowfall is at least
12 inches. Check each point that
matches the given description.
Z
Y
X
❑❑ A. Point Z
❑❑ B. Point W
V
❑❑ C. Point X
W
❑❑ D. Point Y
❑❑ E. Point V
b) Use the scatter plot to describe
what the average annual temperature might be for each city.
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Practice 14-1
4
Homework G
12. Challenge Ten athletes ran two races of the
same length. The scatter plot shows their
times.
a) Identify each of these statements that is
false. Check all that apply.
1. Seven of the times for the first race
were at least 16 seconds.
2. Four of the times for the second race
were less than 17 seconds.
3. There were four athletes who were
faster in the second race than in the
first.
4. There were four athletes who had the same time in both races.
5. There were two athletes whose times in the two races differed by
exactly 1 second.
❑❑ A. Statement 1
❑❑ D. Statement 4
❑❑ B. Statement 3
❑❑ E. Statement 5
❑❑ C. Statement 2
b) Which point on the scatter plot represents the athlete you think should
win overall? Explain.
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Practice 14-1
5
Homework G
ANSWER
KEY
Practice 14-1: Interpreting a Scatterplot
1.The indicated point represents a CD that
has 14 songs and costs $17.
2.C
3.C
4.C
5.a)The indicated point represents a 40 min
storm that produced 12 mm of rain.
b)
Answers will vary
6.a)A, B
b)
Answers will vary
7.a)F
b)
B
8.a)C
b)
Answers will vary
9.a)E
b)
Answers will vary
10. B, D
11. a) A, D
b)
Answers will vary
12. a) A, B
b)
Answers will vary
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Practice 14-1
6
Answer Key G