One way to increase the power of a planned study by altering the amount of variance within each of the two distributions is to:
A)use the variance of the experimental group instead of the variance from the comparison distribution
B)plan to exclude any scores in the sample that are not outliers
C)use more precise measures
D)reduce the number of items on any questionnaires employed

Question

Quizplus · Accepted Answer

Increasing the precision of measures can decrease the amount of variance within each distribution, making it easier to detect statistically significant differences between them. Using the variance of the experimental group instead of the comparison distribution's variance would not be valid, excluding outlier scores can distort results, and reducing the number of items on questionnaires would not affect the distribution's variance.

One Way to Increase the Power of a Planned Study