Which of the following would increase the power of a t-test?
A)Changing $\alpha$ from 0.05 to 0.01
B)Increasing the variability in the raw 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 (option C) would increase the power of the t-test as the larger sample size would provide more accurate estimates of the population parameters. Option A, changing the alpha level, would only affect the likelihood of making a type I error and not the power. Option B would decrease the power as increased variability in raw scores decreases the signal-to-noise ratio, making it harder to detect a significant difference. Option D would also decrease the power as a smaller sample size would provide less accurate estimates of the population parameters.

Which of the Following Would Increase the Power of a T-Test