One of the primary advantages of a repeatedmeasures design, compared to independent-measures, is that it reduces the overall variability by removing variance caused by individual differences. The following data are from a research study comparing two treatment conditions.
a. Assume that the data are from an independentmeasures study using two separate samples, each with n = 6 participants. Compute the pooled variance and the estimated standard error for the mean difference.
b. Now assume that the data are from a repeatedmeasures study using the same sample of n = 6 participants in both treatment conditions. Compute the variance for the sample of difference scores and the estimated standard error for the mean difference.

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Treatment 1 10 12 Treatment 2 Difference 13 12 10 10 M 10 SS 34 SS-10