A repeated-measures study comparing two treatments with a sample of n = 4 participants produces a mean of M₁ = 18 with SS = 24 for the scores in the first treatment,a mean of M₂ = 14 with SS = 18 for the scores in the second treatment,and a mean of MD = 4 with SS = 12 for the difference scores.What is the estimated standard error for the sample mean difference?
A)4
B)3
C)2
D)1

Question

Quizplus · Accepted Answer

The estimated standard error for the sample mean difference (MD) is calculated using the formula SE = sqrt(SS/n), where SS is the sum of squares for the difference scores, and n is the sample size. Substituting the given values, SE = sqrt(12/4) = sqrt(3) ≈ 1.74, which rounds to 1.

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