Critical Thinking Alisha is conducting a paired differences test for a “before

(B score) and after (A score)” situation. She is interested in testing whether the average of the “before” scores is higher than that of the “after” scores.

(a) To use a right-tailed test, how should Alisha construct the differences between the “before” and “after” scores?

(b) To use a left-tailed test, how should she construct the differences between the “before” and “after” scores?