Question: x1 = 18, n1 = 40, x2 = 30, n2 = 40; left-tailed test, = 0.10; 80% confidence interval a. Determine the sample proportions.

x1 = 18, n1 = 40, x2 = 30, n2 = 40; left-tailed test, α = 0.10; 80% 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 18 40 045 p 2 x 2 n 2 30 40 075 p p x 1 x 2 n 1 n 2 48 80 06 b x ... View full answer

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