Why is it preferable to choose a one-sided alternative rather than a two-sided alternative in the situation where you are only interested in results that are extreme in one direction?
A)Your p-value would be half as much as it would be for a two-sided test (assuming the test statistic is the same each time, and is in the direction of the one-sided alternative you selected.)
B)Your results don't have to be as extreme in order to achieve statistical significance.
C)Your conclusions can be more informative because they will have a direction associated with them.
D)All of the above.

Question

Quizplus · Accepted Answer

A one-sided test is preferable in this situation because it requires less extreme results to achieve significance (B), yields a lower p-value for the same test statistic in the direction of interest (A), and provides more informative conclusions due to the directionality of the results (C).

Why Is It Preferable to Choose a One-Sided Alternative Rather