Question: x1 = 30, n1 = 80, x2 = 15, n2 = 20; two-tailed test, = 0.05; 95% confidence interval a. Determine the sample proportions.

x1 = 30, n1 = 80, x2 = 15, n2 = 20; two-tailed test, α = 0.05; 95% confidence interval
a. Determine the sample proportions.
b. Decide whether using the two-proportions z-procedures is appropriate. If so, also do parts (c) and (d).
c. Use the two-proportions z-test to conduct the required hypothesis test.
d. Use the two-proportions z-interval procedure to find the specified confidence interval.

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a p 1 x 1 n 1 30 80 0375 p 2 x 2 n 2 15 20 0750 p p x 1 x 2 n 1 n 2 45 100 045 b x 1 30 n ... View full answer

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