A test of the null hypothesis where the alternative hypothesis is not expressed directionally is called a ________ test.
A) one-tailed
B) two-tailed
C) three-tailed
D) four-tailed
E) A and B

Question

Quizplus · Accepted Answer

A two-tailed test is used when the alternative hypothesis is not expressed directionally, meaning it could be showing an effect in either direction. In this case, the null hypothesis is typically that there is no effect, and the alternative hypothesis is that there is an effect (but without specifying the direction).

A Test of the Null Hypothesis Where the Alternative Hypothesis