Strength of Correlation

Question 1

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

Revolt · Accepted Answer

A graph shows both axes unnumbered. Points are scattered all over the graph.

Question 2

A graph shows the horizontal axis numbered 1 to 5 and the vertical axis numbered 1 to 5. Points and a line show an upward trend.

Revolt · Accepted Answer

0.19

Question 3

A graph shows the horizontal axis numbered 4 to 16 and the vertical axis numbered 4 to 12. Points and a line show a downward trend.

Revolt · Accepted Answer

–0.91

Question 4

The number of grams of zero-calorie sodium in a restaurant meal is compared to the total number of calories in the meal. The correlation coefficient relating the two variables is 0.74.

Revolt · Accepted Answer

It is a strong positive correlation,and it is not likely causal.

Question 5

A 2-column table with 4 rows. The first column is labeled x with entries 0, 5, 10, 15. The second column is labeled y with entries 15, 10, 5, 0.

Revolt · Accepted Answer

-1

Question 6

Which r-value represents the most moderate correlation?

Revolt · Accepted Answer

0.56

Question 7

Which r-value represents the weakest correlation?

Revolt · Accepted Answer

0.11

Question 8

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

Revolt · Accepted Answer

a weak positive correlation

Question 9

Which r–value represents the strongest negative correlation?

Revolt · Accepted Answer

–0.7

Question 10

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.

Revolt · Accepted Answer

It is a weak negative correlation, and it is likely causal.

Strength of Correlation Answers

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