A researcher examines the effectiveness of different body lotions by having 12 participants apply four different lotions to the same, unique body locations daily for two weeks.For example, lotion #1 is always applied to the right thigh, while lotion #2 is applied to the upper right arm.How many post hoc tests will be needed to determine where significant differences occurred?
A) 3
B) 4
C) 6
D) 8

Question

Quizplus · Accepted Answer

With four lotions and 12 participants, there will be a total of 48 unique body locations where each lotion is applied. Therefore, to determine where significant differences occurred, post hoc tests will need to be conducted for each lotion on each unique body location. This results in a total of 4 x 12 = 48 comparisons, and each comparison will require a post hoc test. As a result, there will be 48 post hoc tests that need to be conducted.

A Researcher Examines the Effectiveness of Different Body Lotions by Having