7th Grade Math

Lesson 4B More Statistical Displays 537

= Step-by-Step Solutions begin on page R1.

Extra Practice begins on page EP2.

Examples 1 and 2 33 MONUMENTS Use the graph that shows

261048

Number of Steps

400

500

300

200

100

0

Time (min)

Climbing the

the time it takes Ciro to climb the Statue Statue of Liberty

of Liberty.

a. Identify the relationship between the

two variables.

b. Construct a line of best fit.

c. Predict the time it will take Ciro to climb

354 steps to reach the top.

Example 3 4. SCHOOL Use the graph that

20 40

Test Score^70

75

80

85

90

95

100

65

60

55

Time Spent Studying (min)

Study Time and Test Scores

60 80 100

shows the times students

spent studying for a test

and their test scores.

a. What score should a student

who studies for 50 minutes

be expected to earn?

b. If a student scored 90 on the

test, about how much time

can you assume the student

spent studying?

(^) B 5. SLEEP Use the table that shows the relationship Hours of
Sleep
Math Test
Score
996
888
776
671
between hours of sleep and scores on a
math test.
a. Display the data in a scatter plot.
b. Describe the relationship, if any, between
the two variables.
c. Predict the test score for someone that sleeps
for 5 hours.

6. BASEBALL Use the table at the right. Player At Bats Hits
   C. Guzman 403 126
   I. Kinsler 398 134
   D. Pedroia 395 124
   J. Reyes 394 119
   I. Suzuki 391 119
   M. Young 391 118
   O. Cabrera 385 104
   D. Lee 382 117

a. Make a scatter plot of the data to show

the relationship between at bats

and hits.

b. Predict the number of hits if 500 at bats

occurred.

c. Describe the trend in the data.

534_545_C09_L4_895130.indd 537 1/11/10 9:46 AM