12. For each of the following, calculate the pooled vari- ance and the estimated standard error for the sample mean difference. a. The first sample has n = 4 scores and a variance of s = 55, and the second sample has n = 6 %3D %3D %3D scores and a variance of s? = 63. b. Now the sample variances are increased so that the first sample has n = 220, and the second sample has n = 6 scores and a variance of s? 4 scores and a variance of %3D 252. %3D c. Comparing your answers for parts a and b, how does increased variance influence the size of the estimated standard error?

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