Chapter 8.3, Problem 12E

a.

To determine

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

b.

To determine

To find: The critical value and rejection regions.

c.

To determine

To find: The value of $\overline{d}$ and $s_d$.

d.

To determine

To find: The standardized test statistic t.

e.

To determine

To decide: Whether to reject or fail to reject the null hypothesis when the level of significance $\alpha =0.05$.

f.

To determine

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