What happens if researchers specify a one-tailed hypothesis test, and the test statistic is large (e.g., Z = 3.5) but in the direction opposite of the alternative hypothesis?
A) The test is invalid.
B) The test should be conducted again, but at a different alpha level.
C) The null hypothesis cannot be rejected.
D) The null hypothesis is rejected in favour of the alternative hypothesis.

Question

Quizplus · Accepted Answer

In a one-tailed test, the rejection region is only on one side of the distribution. If the test statistic falls in the opposite direction, it does not fall into the rejection region, so the null hypothesis cannot be rejected.

What Happens If Researchers Specify a One-Tailed Hypothesis Test, and the Test