What is the argument for using a one-tailed test when there is a clear basis for predicting a result in a given direction?
A)The underlying mathematics of one-tailed tests are more accurate.
B)If the result is opposite to the prediction, the researcher can still do a two-tailed test later.
C)It is more conservative, in the sense that in using a one-tailed test it is harder to reject the null hypothesis.
D)A particular theory is being tested, and if the results come out opposite to the theory, that adds no more information than if the result simply had not been significant.

Question

Quizplus · Accepted Answer

Using a one-tailed test is appropriate when there is a clear theoretical basis for predicting a result in a specific direction. If the results come out opposite to the theory being tested, it adds no more information, so a two-tailed test would not provide any additional insights. Additionally, a one-tailed test is typically more powerful than a two-tailed test, as it focuses all the statistical power on one direction of the test.

What Is the Argument for Using a One-Tailed Test When