Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below. It can be shown that for these data: Calculate the sample correlation coefficient.
A)0.12
B)-0.12
C)-0.36
D)-0.34
E)0.34

Question

Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below.  It can be shown that for these data:  Calculate the sample correlation coefficient.
A)0.12 
B)-0.12 
C)-0.36 
D)-0.34 
E)0.34

Quizplus · Accepted Answer

Using the formula for sample correlation coefficient, we get r = (-8.36)/24.5 = -0.3418, which is approximately -0.34. Therefore, the answer is D.

Researchers Wish to Study Fuel Consumption Rates Based on Speed