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 ( micro 1 micro 2) b Test H0 ( micro 1 micro 2) 0 against Ha ( micro 1 micro 2) 0 Use Icirc plusmn 01 c What sample sizes would be required if you wish to estimate ( micro 1 micro 2) to within 2 with 90 confidence Assume that n1 n2 Sample 1 Sample 2 ni 135 12 2 s 2 1 122 148 Xy 8 3 3 0

Question: 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

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 Î± = .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.

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

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