Question: Consider the gasoline mileage data in Exercise 12-5. (a) What proportion of total variability is explained by this model? (b) Construct a normal probability plot

Consider the gasoline mileage data in Exercise 12-5.
(a) What proportion of total variability is explained by this model?
(b) Construct a normal probability plot of the residuals and comment on the normality assumption.
(c) Plot residuals versus and versus each regressor. Discuss these residual plots.
(d) Calculate Cook’s distance for the observations in this data set. Are any observations influential?

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