Refer to Exercise 13.76.
a. Use a variable selection program to obtain the best four models of all possible sizes using R2adj as your criterion. Obtain values for R2, MSE, and Cp for each of the models.
b. Using the information in part (a), select the model that you think best meets the ­criteria of a good fit to the data and the minimum number of variables.
c. Which variables were most highly related to sulfur dioxide air pollution?
In exercise

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