You Have a Situation in Which Three Variables-X, Y, and Z-Are

Multiple Choice

You have a situation in which three variables-X, Y, and Z-are correlated with one another. You find that the partial correlation of X with Y controlling for Z is zero. This finding means that

A) Z is a cause of both X and Y.
B) the relationship between X and Y can be completely accounted for by their common relationships with Z.
C) scores on Z cannot be used to predict scores on either X or Y.
D) both a and b