Rex All developed what he thinks is a miracle drug to cure baldness. He asks you for advice on how to maximize statistical power so that he can "prove" that Hair Today really works. You tell him that the best way to maximize power is to:
A) Increase the sample size
B) Set the alpha level at .10
C) Use a nondirectional hypothesis
D) Use a directional hypothesis

Question

Quizplus · Accepted Answer

The best way to maximize power is to increase the sample size. This allows for a larger representation of the population, reducing the likelihood of sampling errors and increasing the ability to detect significant differences between groups. Setting the alpha level at .10 does not maximize power, as it increases the likelihood of a Type I error (rejecting the null hypothesis when it is true). Using a nondirectional hypothesis also does not necessarily maximize power, as it is more flexible but may not provide enough specificity to detect significant differences. Using a directional hypothesis may increase power in some cases, but it also increases the likelihood of a Type I error if the directionality assumption is incorrect.

Rex All Developed What He Thinks Is a Miracle Drug