In theory, one could increase the power of planned study by:
A)increasing the effect size by increasing the predicted difference between population means
B)increasing effect size by decreasing the population standard deviation
C)using a one-tailed test
D)all of the above

Question

Quizplus · Accepted Answer

All three options can potentially increase the power of planned study. By increasing the effect size through a larger predicted difference between population means (option A) or a smaller population standard deviation (option B), the study will be better able to detect a significant difference between the groups being compared. Additionally, using a one-tailed test (option C) may increase power because it allows the researcher to focus exclusively on one direction of the hypothesis, rather than having to account for the possibility of the effect going in either direction. However, it is important to note that choosing a one-tailed test should only be done in situations where there is a compelling theoretical or empirical reason to expect a very specific directional effect.

In Theory, One Could Increase the Power of Planned Study