Oftentimes, researchers clearly have an expectation of what a research study will find, and thus, a directional (one-tailed) hypothesis makes sense. Why, however, might it be better to use a nondirectional (two-tailed) hypothesis test?
What will be an ideal response?
Ans: A nondirectional (two-tailed) hypothesis test makes it more difficult to reject the null hypothesis. Therefore, with a nondirectional hypothesis test, we would need to have stronger evidence from the sample data to reject the null hypothesis than we would need from a directional hypothesis test.
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