For Exercises 11.1 and 11.2, see page 533; for 11.3 and 11.4, see page 535; for 11.5 and 11.6, see page 537; for 11.7 and 11.8, see page 538; for 11.9 and 11.10, see page 541; for 11.11 to 11.14, see pages 543–544; and for 11.15 and 11.16, see page 544.
11.11 Examine the residuals.
In Exercise 11.9, you ran a multiple regression using the data in Table 11.2 (page 536). Obtain the residuals from this regression and plot them versus each of the explanatory variables. Also, examine the Normality of the residuals using a histogram or stemplot. If possible, use your software to make a Normal quantile plot. Summarize your conclusions.
11.11
The two residual plots show the curvature problem we noted in the previous exercise. The Normal quantile plot shows that the residuals are not Normally distributed because of several outliers on either tail.
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