Consider Example 70 and the data set in figure 13.7.
(a) Make a plot of the residuals c, against the lilted values y,. Make a plot of the residuals c, against the temperature values v,. Do either of these plots alert you to any problems with the regression analysis?
(b) bind the standardized residuals. Are any of them unusually large?
(c) find the leverage values hii. Which points have the largest influence on the titled regression line?