When is a one-tailed test used?
A)When no relationship is predicted
B)When a relationship is predicted and the direction in which the scores will change is predicted
C)When the demonstrated relationship is predicted
D)When a relationship is predicted without stating the direction in which the scores will change

Question

Quizplus · Accepted Answer

A one-tailed test is used when a relationship is predicted and the direction in which the scores will change is predicted. This is because a one-tailed test allows for greater statistical power by focusing on only one direction of the distribution, whereas a two-tailed test considers both directions of change. Therefore, it is best to use a one-tailed test when a relationship is predicted and its direction is known.

When Is a One-Tailed Test Used