A(n) ______ hypothesis predicts a directional effect, whereas a(n) ______ hypothesis predicts an effect in either direction.
A) one-tailed; two-tailed
B) two-tailed; one-tailed
C) null; alternative
D) alternative; null

Question

Quizplus · Accepted Answer

A one-tailed hypothesis predicts the direction of the effect (e.g. "Group A will perform better than Group B"), while a two-tailed hypothesis does not make a directional prediction (e.g. "There will be a difference in performance between Group A and Group B, but we don't know which group will perform better"). The null hypothesis states that there is no significant difference between groups or conditions, while the alternative hypothesis proposes that there is a significant difference. Therefore, the best choice is A.

A(n) ______ Hypothesis Predicts a Directional Effect, Whereas A(n) ______

A(n) Hypothesis Predicts a Directional Effect, Whereas A(n)