What factors are truly useful in predicting a chief executive officer’s annual base salary? Explore this question by employing a stepwise regression procedure on potentially relevant variables for which survey data have been collected and recorded in the file P2_13.XLS. Assess only those variables that make economic sense in predicting CEO base salaries. Also, consider incorporating a set of categorical variables to account for any potential variation in the base salaries that is explained by the CEO’s company type. Use the p-value method with a cutoff value of 0.10. Summarize your findings.