Answer: Consider the gasoline mileage data in Exercise

Chapter 12, Problem 69E

(choose chapter or problem)

Consider the gasoline mileage data in Exercise 12-11.
(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 \(\hat{\mathrm{y}}\) and versus each regressor. Discuss these residual plots.
(d) Calculate Cook's distance for the observations in this data set. Are any observations influential?

Equation Transcription:

Text Transcription:

\hat y

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