Linear Association

Mr. Larson recorded the heights and arm spans of the students in his science class. The results are shown on the scatterplot. Using the scatterplot, which best predicts the arm span of a student who is 57 inches tall?

• 58

• 57

• 55

• Not enough information

Which scatter plot shows a linear relationship between x and y?

• Graph A

• Graph B

• Graph C

• Graph D

Which sentence best supports the relationship shown on this scatter plot?

• The more time spent training, the longer it takes to run 100 m.

• As the time spent training increases, the time to run 100 m decreases.

• As the time spent training decreases, the time to run 100 m decreases.

• There is no apparent association between the amount of time spent training and the time it takes to run 100 m.

What conclusion can be made about the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase.

• As the temperature increases, the number of visitors increases.

• As the visitors increase, the temperature decreases.

• No correlation

Molly collected data about the number of hours students studied and their scores on a test. The results are shown in the scatter plot. Which conclusion about the data is true?

• As study hours increase, test scores decrease.

• As study hours increase, test scores increase.

• As study hours increase, test scores stay the same.

• As study hours decrease, test scores increase.

As the age of the car increases, its value decreases. Which scatterplot represents this relationship?

• A

• B

• C

• D

Julie made 25 international long-distance phone to London last month. The scatter plot below shows the length and cost of each phone call she made. Which conclusion is best supported by the scatter plot?

• As the length of the call increases, the cost of the call increases.

• As the length of the call increases, the cost of the call remains the same.

• As the length of the call increases, the cost of the call decreases.

• There is no relationship between the length of the call and the cost of a call.

Charlie rented a moving truck. He paid a daily fee plus a per-mile fee to rent the truck. The equation below represents the daily amount Charlie paid for the truck if he drives it x miles.
y=0.5x+10
What does the slope of the graph of this equation represent?

• The daily fee for the moving truck

• The per-mile fee for the moving truck

• How much Charlie paid for the truck

• The number of miles he drove

Which of the following could be a possible line of best fit for the data?

• y = -5/2x + 20

• y = -x + 19

• y = x + 20

• y = 2/3x + 15 

About how many male math teachers were there in 2006?

• 15

• 30

• 35

• 45