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March 6, 2015

March 6, 2015

Posted by **Sharon** on Sunday, November 11, 2012 at 8:25pm.

a. Each sample has n _ 5 scores with s2 _ 38 for the first sample and s2 _ 42 for the second. (Note: Because the two samples are the same size, the pooled variance is equal to the average of the two sample variances.)

b. Each sample has n _ 20 scores with s2 _ 38 for the first sample and s2 _ 42 for the second.

c. In part b, the two samples are bigger than in part a, but the variances are unchanged. How does sample size affect the size of the standard error for the sample mean difference?

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