Chapter 9.4, Problem 8E

a.

To determine

To identify: The claim and state $H_0$ and $H_1$.

b.

To determine

To find: The critical value $\alpha =0.10$.

c.

To determine

To find: The test value.

d.

To determine

To make: The decision.

e.

To determine

To summarize: The result.

To find: The 90% confidence interval for the difference of the two proportions.

To check: Whether the confidence interval contains 0 or not.