Independent random samples, each containing 800 observations, were selected from two binomial populations. The samples from populations 1 and 2 produced 320 and 400 successes, respectively.
a. Test H0: (p1 - p2) = 0 against Ha: (p1 - p2) ≠ 0. Use α = .05.
b. Test H0: (p1 - p2) = 0 against Ha: (p1 - p2) ≠ 0. Use α = .01.
c. Test H0: (p1 - p2) = 0 against Ha: (p1 - p2)<0. Use α = .01.
d. Form a 90% confidence interval for (p1 – p2)
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