A repeated-measures study comparing two treatments with a sample of n = 4 participants produces MD = 3 with SS = 48 for the set of difference scores.What is the repeated-measures t statistic for these data?
A)3/√3 = 1.73
B)3/2 = 1.50
C)3/4 = 0.75
D)3/16 = 0.19

Question

Quizplus · Accepted Answer

The repeated-measures t statistic formula is t = MD / (SDdiff / sqrt(n)). Since n = 4 and SS = 48, then the variance of the difference scores is: SS / (n-1) = 48 / 3 = 16. Thus, the standard deviation of the difference scores is sqrt(16) = 4. Plugging in the values, we get t = 3 / (4 / sqrt(4)) = 3 / 2 = 1.5. Therefore, the correct answer is B.

A Repeated-Measures Study Comparing Two Treatments with a Sample of N