When we are testing directional hypotheses, we should:
A)Never use a two-tailed test.
B)Always use a two-tailed test.
C)Use a two-tailed test if we want to be able to reject the null hypothesis in case our findings are in the opposite direction from the one predicted in our hypothesis.
D)None of these.

Question

Quizplus · Accepted Answer

When we have a specific prediction about the direction of the relationship between variables, we should use a directional (one-tailed) hypothesis test. However, we should also be aware that our findings could potentially go in the opposite direction from what we predicted. To allow for this possibility, we can use a two-tailed test, which will give us the option to reject the null hypothesis if our findings are significant in either direction. Therefore, using a two-tailed test is the best choice when testing directional hypotheses.

When We Are Testing Directional Hypotheses, We Should