Question: Consider the regression model for the NFL data in Exercise 12-4. (a) What proportion of total variability is explained by this model? (b) Construct a

Consider the regression model for the NFL data in Exercise 12-4.
(a) What proportion of total variability is explained by this model?
(b) Construct a normal probability plot of the residuals. What conclusion can you draw from this plot?
(c) Plot the residuals versus and versus each regressor, and comment on model adequacy.
(d) Are there any influential points in these data?

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