7th Grade Math

538 Statistical Displays

77 SCHOOLS Use the graph that Voters in Clinton County

2002 2004 2006 2008 2010 2012

10,000

20,000

30,000

40,000

50,000

60,000

Voters

Year

shows the number of voters in

Clinton County for several

years.

a. Describe the relationship, if

any, between the two sets

of data.

b. If the trend continues, what

will be the average number

of voters in 2011?

8. MULTIPLE REPRESENTATIONS The

Amount Spent ($)

2001200220032004200520062007

6,400

6,200

6,000

5,800

5,600

5,400

5,200

5,000

4,800

4,600

Year

American Food Spending

graph shows the amount of money

Americans spent each year on food.

a. WORDS For each graphed point,

what does the x-value represent?

y-value represent?

b. WORDS Describe the trend in the

graph.

c. GRAPHS Construct a line of best

fit.

d. NUMBERS Predict the amount

Americans will spend on food in

2012.

9. PETS What can you conclude about

78910 11 12 13 14 15

Number of Pets

Age

Age and Number of Pets

5 4 3 2 1 0

the relationship between pet owner

age and number of pets in the

scatter plot at the right?

C 10. OPEN ENDED Name two sets of data that can be graphed on a scatter plot.

11. Which One Doesn’t Belong? Identify the term that does not have the same
    characteristics as the other three. Explain your reasoning.

line plot mode bar graph scatter plot

12. E WRITE MATH Explain how a graph can be used to make predictions.

Real-World Link

Research shows that

cats have better

memories than dogs.

A dog’s memory lasts

no longer than 5

minutes, while a cat’s

memory can last up

to 16 hours.

RRR

534_545_C09_L4_895130.indd 538 1/11/10 9:46 AM