In general, which of the following tests is the most powerful test to detect a difference between group means?
A) a t test for a planned comparison
B) the HSD test
C) the Scheffé test
D) all are equally powerful

Question

Quizplus · Accepted Answer

A t test for a planned comparison is the most powerful test as it is specifically designed to test a hypothesis about a difference between two group means. The other tests (HSD and Scheffé) are more appropriate for overall familywise error rate control when multiple comparisons are being made.

In General, Which of the Following Tests Is the Most