Chapter 14.3, Problem 17AYU

(a)

To determine

To construct: Correlation matrix between $x_1,x_2\text{and}y$.

To determine

To find: Whether multicollinearity is a problem or not.

(b)

To determine

Least-squares regression line.

(c)

To determine

To draw: Residual plots of the model.

To determine

To draw: Boxplot of the residuals.

(d)

To determine

To interpret: The regression coefficients.

(e)

To determine

To compute: $R^2$ and adjusted $R^2$.

(f)

To determine

To test: The provided hypothesis.

(g)

To determine

The provided hypothesis.

(h)

To determine

To predict: Mean 28-day strength.

(i)

To determine

To predict: 28-day strength for a selected sample.

(j)

To determine

95% prediction and confidence intervals.