Two independent random samples are taken from two populations. The results of these samples are summarized in the next table.

a. Form a 90% confidence interval for (µ1 - µ2).
b. Test H0: (µ1 - µ2) = 0 against Ha: (µ1 - µ2) ‰  0. Use α = .01.
c. What sample sizes would be required if you wish to estimate (µ1 - µ2) to within .2 with 90% confidence? Assume that n1 = n2.

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Sample 1 Sample 2 ni = 135 지 = 12.2 s 2.1 122 = 148 Xy 8.3 = 3.0