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?