When you hypothesize that posttest scores will be higher than pretest scores,you should use ______.
A)a one-tailed test
B)a two-tailed test
C)descriptive statistics
D)a t test for independent means

Question

Quizplus · Accepted Answer

A one-tailed test is appropriate in this case because we have a directional hypothesis (posttest scores will be higher than pretest scores). A one-tailed test allows us to test this specific direction of the hypothesis. A two-tailed test would be appropriate if we had a non-directional hypothesis (there will be a difference between posttest and pretest scores). Descriptive statistics alone cannot test the hypothesis. A t test for independent means would be appropriate if we were comparing the means of two separate groups, which is not the case in this scenario.

When You Hypothesize That Posttest Scores Will Be Higher Than