Question

Please Help...

A research group is trying to determine the correlation between the number of hours spent

studying and the number of hours sleeping. Use the data shown on the graph to compute

the correlation coefficient.

A) r = 1 C) r = − 1

B) r = 0.5 D) r = −0.5

Answer 1

Answer: C

Step-by-step explanation: did usa test prep

Answer 2

C) r = − 1

Explanation:

In the graph, you can observe that all five points are perfectly lined up on a straight line, which is decreasing, because each points is lower than the previous one.

This situation represents a coefficient of correlation of -1, which means there's a strong negative correlation between variable.

Once again, graphically, this strong negative correlation can be deduct from the behaviour of the data, which is clearly decreasing with a straight line behaviour. In other words, the line that best fits is almost unique.

Therefore, the right answer is C.