When Are Two Samples Considered to Be Related

Multiple Choice

When are two samples considered to be related?

A) When we randomly assign participants to samples without regard to other participants selected for either sample
B) When we pair each score in one sample with a particular score in the other sample
C) When we randomly select participants to samples,making sure that each participant serves in only one condition of our experiment
D) When the null hypothesis of the two-sample t-test is retained