Consider the regression model fi t to the coal and
Chapter 12, Problem 75E(choose chapter or problem)
Consider the regression model to the coal and limestone mixture data in Exercise 12-17. Use density as the response.
(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 \(\hat{y}\) and versus each regressor, and comment on model adequacy.
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