Chapter 8.4, Problem 10E

a.

To determine

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

b.

To determine

To find: The critical value and rejection region with $\alpha =0.05$.

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 $\alpha =0.05$.

e.

To determine

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