Chapter 11.1, Problem 20E

a.

To determine

To identify: The claim; and to state $H_0$ and $H_1$

b.

To determine

To find: The critical value.

c.

To determine

To find: The test statistic.

d.

To determine

To decide: Whether to reject or fail to reject the null hypothesis at a level of significance

$\alpha =0.05$.

e.

To determine

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