# When we conduct a one tailed test instead of a two

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3. When we conduct a one-tailed test instead of a two-tailed test, there are small changes in steps 2 and 4 of hypothesis testing. ( Note: For this example, assume that those from populations other than the one on which it was normed will score lower, on average. That is, hypothesize that the Canadians will have a lower mean.) Conduct steps 2, 4, and 6 of hypothesis testing for a one-tailed test.
4. Under which circumstance—a one-tailed or a two-tailed test—is it easier to reject the null hypothesis? Explain.
5. If it becomes easier to reject the null hypothesis under one type of test (one-tailed versus two-tailed), does this mean that there is a bigger difference between the groups with a one-tailed test than with a two-tailed test? Explain.
6. When we change the p level that we use as a cutoff, there is a small change in step 4 of hypothesis testing. Although 0.05 is the most commonly used p level, other values, such
7. With which p level—0.05 or 0.01—is it easiest to reject the null hypothesis? Explain.
8. If it is easier to reject the null hypothesis with certain p levels, does this mean that there is a bigger difference between the samples with one p level versus the other p level? Explain.