Which of the following would increase the power of a significance test for correlation?
A)Changing $\alpha$ from 0.05 to 0.01
B)Increasing the variability in the Y scores
C)Changing the sample size from N = 25 to N = 100
D)Changing the sample size from N = 100 to N = 25

Question

Quizplus · Accepted Answer

Increasing the sample size typically increases the power of a significance test, meaning it is more likely to detect a true correlation. Option A would actually decrease the power by making the significance level more stringent. Option B may increase or decrease the power depending on whether the increased variability includes more systematic or random variation. Option D would also decrease the power by reducing the sample size.

Which of the Following Would Increase the Power of a Significance