3.Which model does not lend itself to correlation coefficient analysis?

A)   Y = X + 2.

B)   X = Y × 2.

C)   Y – X = 2.

D)   Y = X³.

The correct answer was D)

The correlation coefficient is a measure of linear association. All of the functions except for Y = X³ are linear functions. Notice that Y – X = 2 is the same as Y = X + 2.