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 c. 2
b. 3 d. 1


D

Psychology

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