Crazy Dave has expanded his analysis, presented in Problem 14.73 on page 619, of which variables are important in predicting a team's wins in a given baseball season. He has collected data in related to wins, ERA, saves, runs scored, hits allowed, walks allowed, and errors for the 2009 season.
a. Develop the most appropriate multiple regression model to predict a team's wins. Be sure to include a thorough residual analysis. In addition, provide a detailed explanation of the results.
b. Develop the most appropriate multiple regression model to predict a team's ERA on the basis of hits allowed, walks allowed, errors, and saves. Be sure to include a thorough residual analysis. In addition, provide a detailed explanation of the results.