Question

20. Explain how the power of a hypothesis test is
influenced by each of the following. Assume that all
other factors are held constant.
a. Increasing the alpha level from .01 to .05.
b. Changing from a one-tailed test to a two-tailed test.

Answer 1

Increasing alpha from .01 to .05 increases the power of the test. The higher the level, the more powerful the test.

If the test is one-tailed, the test will be more powerful because one is less likely to miss a statistically significant test if the predicted direction is accurate.

I hope this helps.