Chapter 13.3, Problem 11E

a)

To determine

To find: The equation of the multiple regression line.

b)

To determine

To find: The value of y when $x_1=1,x_2=4.5,x_3=6.2$ .

c)

To determine

To find: The percentage of variation that has been explained in the model.

d)

To determine

To explain: Whether the model is useful for prediction.

e)

To determine

To check: Whether the null hypotheses could be rejected for the hypotheses

, $\begin{array}{l}{H}_0:{\beta }_i=0\\ H_a:{\beta }_i\ne 0\\ \text{Where,}\\ i=1,2,3\end{array}$