Directions: Draw a circle around your answer(s) for each question and show all of

your work.

Graded Question #1: Unit E Exercise 14 Page 215

The following table shows hypothetical data on resting heart rates for eight people who are

all about the same age, height, and weight but exercise different amounts per week.

Person

Exercise (hours per week) Resting heart rate

A

10

57

B

6

64

C

4

75

D

5

72

E

3

70

F

7

70

G

8

58

H

2

78

(a) Make a scatterplot for the data.

(b) Would you say that this graph shows a positive correlation, a negative correlation,

or no correlation? Explain.Graded Question #2: Unit E Exercise 16 a

The scatterplot below shows literacy rates for youth (1825-year-olds) and for the elderly

(those over 65) in ten representative countries. (Source: World Bank)

State whether the diagram shows a positive correlation, negative correlation, or no

correlation. If there is a correlation, is it strong or weak?

Graded Question #3

SAT Scores by Shoe Size

State whether the diagram shows a positive correlation, negative correlation, or no

correlation. If there is a correlation, is it strong or weak?Graded Question #4: Unit E Exercise 32 Page 217

Over the past three decades, the number of miles of freeways in Los Angeles has grown,

and traffic congestion has worsened. Is the correlation positive or negative? Also state

whether the correlation is most likely due to coincidence, a common underlying cause, or

a direct cause. Explain your answer.

Graded Question #5: Unit E Exercise 34 Page 217

In the past three decades, levels of atmospheric carbon dioxide have increased while the

volume of Arctic ice has decreased. Is the correlation positive or negative? Also state

whether the correlation is most likely due to coincidence, a common underlying cause, or

a direct cause. Explain your answer.

Graded Question #6

You are investigating why your garden plants have been wilting over the past month. Read

each observation below and explain what you concluded.

Observation

The wilting is much worse in plants that are close to the new fertilizer you started using.

Research shows that overuse of fertilizers containing high salt levels can damage plant

roots and cause wilting.

You have tested the soil for pests and diseases and found no signs of infection or

infestation.

Having made all these observations, what reasonable conclusion can you reach about the

cause of the wilting plants?

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