One way of decreasing the standard deviation of the distribution of means in a planned study, thereby increasing power, is to have a larger number of participants. Another would be to:
A)use a more stringent alpha level
B)use the sample variance in place of the variance of the population
C)change the minimum meaningful difference.
D)use a less diverse population

Question

Quizplus · Accepted Answer

Using a less diverse population reduces the variability within the data, which in turn decreases the standard deviation of the distribution of means. This can increase the statistical power of a study by making it easier to detect a true effect, if one exists.

One Way of Decreasing the Standard Deviation of the Distribution