Which of the following will increase the power of a statistical test?
A)Change α from .05 to .01
B)Change from a one-tailed test to a two-tailed test
C)Change the sample size from n = 25 to n = 100
D)None of the other options will increase power.

Question

Quizplus · Accepted Answer

Increasing the sample size from n = 25 to n = 100 will increase the power of a statistical test. This is because a larger sample size increases the likelihood of detecting a true difference or relationship between variables. Changing α from .05 to .01 may increase the significance level required to reject the null hypothesis, but it does not necessarily increase power. Changing from a one-tailed test to a two-tailed test may increase the probability of a Type II error (i.e., failing to reject a false null hypothesis), which reduces power. Therefore, the best choice is C.

Which of the Following Will Increase the Power of a Statistical