Suppose that X and Y are uncorrelated. X has a mean of 15 and Y has a mean of 19. Given a score of 14 on a particular X observation, the best prediction of Y is
A) 0.
B) 15.
C) 19.
D) indeterminate.

Question

Suppose that X and Y are uncorrelated. X has a mean of 15 and Y has a mean of 19. Given a score of 14 on a particular X observation, the best prediction of Y is
A)	0.
B)	15.
C)	19.
D)	indeterminate.

Quizplus · Accepted Answer

When two variables are uncorrelated, the best prediction for one variable given a value of the other is simply the mean of the variable being predicted. Since Y has a mean of 19, the best prediction for Y is 19.

Suppose That X and Y Are Uncorrelated