Two independent random samples are taken from two populations. The results of these samples are summarized in the following table:
a. Form a 90% confidence interval for (μ1 – μ2).
b. Test H0: (μ1 – μ2) = 0 against Use α = .01.
c. What sample size would be required if you wish to estimate (m1 - m2) to within .2 with 90% confidence? Assume that n1 = n2.
Sample 1 | Sample 2 |
n1 = 135 = 12.2 s21= 2.1 | n2 = 148 = 8.3 s22= 3.0 |
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