Chapter 13, Problem 13.28SE

a.

To determine

To find: Whether data provide sufficient evidence to show that the model contributes information for the prediction of mean daily kilowatt-hour consumption per household at the 5% level of significance.

b.

To determine

To construct: The curve that depicts $\widehat{y}$ per kilowatt-hour. Also, check whether consumption curves are different are not.

c.

To determine

To find: Whether price per kilowatt hour $x_2$ contributes significant information for the prediction of y .

d.

To determine

To compare: The values of $R^2\left(\text{adj}\right)$ of two models. And, mention the models that would be recommended.