A study with two groups in a repeated measured design lends itself to what statistical test for comparing means?

Assume that variables X and Y are significantly correlated; the concept of reverse causality tells us that

a. X causes Y but not the reverse. b. Y causes X but not the reverse. c. X might cause Y or Y might cause X. d. X causes Y and Y causes X.

People with borderline personality disorder tend to see people and situations only in black and white.

a. true b. false