Consider the multiple regression model fit to the National Football League team performance data in Problem 3.1.
a. Construct a normal probability plot of the residuals. Does there seem to be any problem with the normality assumption?
b. Construct and interpret a plot of the residuals versus the predicted response.
c. Construct plots of the residuals versus each of the regressor variables. Do these plots imply that the regressor is correctly specified?
d. Construct the partial regression plots for this model. Compare the plots with the plots of residuals versus regressors from part