The file FTMBA contains a sample of 2012 top-ranked full-time MBA programs. Variables included are mean starting salary upon graduation ($), percent of students with job offers within three months of graduation, program cost ($), and total number of students per program.

Develop the most appropriate multiple regression model to predict the mean starting salary upon graduation. Be sure to include a thorough residual and influence analysis. In addition, provide a detailed explanation of the results, including a comparison of the most appropriate multiple regression model to the best simple linear regression model?