Chapter 9, Problem 9.1.2RE

a.

To determine

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

b.

To determine

To find: The critical value and rejection region for a two-tailed test with $\alpha =0.10$.

c.

To determine

To find: The standardized test statistic z.

d.

To determine

To decide: Whether to reject or fail to reject the null hypothesis at a level of significance of $\alpha =0.01$.

e.

To determine

To interpret: The decision in the context of the original claim.