Strength of Correlation Answers

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Which r-value represents the most moderate correlation?

A
–0.92
B
–0.18
C
0.56
D
0.83
2
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Which relationships would most likely be causal? Select two options.a positive correlation between the number of homework assignments completed and the grade on the exama positive correlation between the temperature in a canyon in the early spring and the number of snakes seen by hikersa positive correlation between a child’s shoe size and reading speeda negative correlation between the time a glass of ice water sits on the counter and its temperaturea positive correlation between the number of students attending football games and the number of games that are won

A
a positive correlation between the number of homework assignments completed and the grade on the exam
B
a positive correlation between the temperature in a canyon in the early spring and the number of snakes seen by hikers
C
a positive correlation between a child’s shoe size and reading speed
D
a negative correlation between the time a glass of ice water sits on the counter and its temperature
E
a positive correlation between the number of students attending football games and the number of games that are won
3

The number of times a player has golfed in one’s lifetime is compared to the number of strokes it takes the player to complete 18 holes. The correlation coefficient relating the two variables is –0.26.

A
It is a weak negative correlation, and it is not likely causal.
B
It is a weak negative correlation, and it is likely causal.
C
It is a strong negative correlation, and it is not likely causal.
D
It is a strong negative correlation, and it is likely causal.
4

Which best describes the strength of a model with an r-value of 0.29?

A
a weak positive correlation
B
a strong positive correlation
C
a weak negative correlation
D
a strong negative correlation
5

Which graph shows data whose r-value is most likely closest to 0?

A
A graph shows both axes unnumbered. Points show a downward trend.
Option A
B
A graph shows both axes unnumbered. Points show an upward trend.
Option B
C
A graph shows both axes unnumbered. Points show a downward trend.
Option C
D
A graph shows both axes unnumbered. Points are scattered all over the graph.
Option D
6

Which r–value represents the strongest negative correlation?

A
–0.7
B
–0.22
C
0.38
D
0.9
7

Ryan gathered data about the age of the different dogs in his neighborhood and the length of their tails.

Question illustration
A
It is a weak negative correlation, and it is not likely causal.
B
It is a weak negative correlation, and it is likely causal.
C
It is a strong negative correlation, and it is not likely causal.
D
It is a strong negative correlation, and it is likely causal.
8

Which r-value represents the strongest correlation?

A
–0.83
B
–0.67
C
0.48
D
0.79
9

Which r-value represents the weakest correlation?

A
–0.75
B
–0.27
C
0.11
D
0.54
10

The table shows the time a patient spends at the dentist and the amount of the bill.

Question illustration
A
–0.93
B
–0.27
C
0.27
D
0.93

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