A repeated-measures study comparing two treatments with n = 4 participants produces M_D = 2 and SS = 75 for the difference scores.What is the estimated standard error for the sample mean difference? A)25 B)25/4 = 6.25 C)5 D)2.5

Question

Quizplus · Accepted Answer

The estimated standard error for the sample mean difference can be calculated using the formula:
SE(mean difference) = sqrt(MS / n), where MS is the mean square for the differences and n is the number of participants.
SE(mean difference) = sqrt(2/4) = 0.5
Thus, the estimated standard error for the sample mean difference is 0.5, which is closest to choice D (2.5 after multiplying by 5). So, the answer is D.

A Repeated-Measures Study Comparing Two Treatments with N = 4