If a one-sided test rejects the null hypothesis, then a two-sided test would have rejected the null hypothesis as well.

Question

Quizplus · Accepted Answer

A one-sided test can reject the null hypothesis if the observed effect is in the direction specified by the alternative hypothesis, even if the magnitude of the effect is not large enough to reject the null hypothesis in a two-sided test, which looks for effects in both directions.

If a One-Sided Test Rejects the Null Hypothesis, Then a Two-Sided