For a one-tailed test of significance, the
A) probability of a Type I error is half as big as for a two-tailed test of significance
B) rejection region is in one part of the sampling distribution instead of two
C) neither of the other alternatives is correct.

Question

Quizplus · Accepted Answer

In a one-tailed test, the rejection region is indeed located entirely in one tail of the sampling distribution, unlike a two-tailed test where the rejection regions are split between both tails of the distribution. This focuses the test on detecting an effect in a specific direction.

For a One-Tailed Test of Significance, the