1. (10 pts.) Using the data set SASHELP.BASEBALL in the sashelp library of SAS, propose a multiple regression model to predict the salary (Salary). Discuss why the proposed model is the appropriate and (maybe) the best. Make sure you include the discussion of the model assumption checking. [Hint: use PROC REG.] 2. (10 pts.) Determine whether the variables division at the end of 1986 (division), league at the end of 1986 (league), and position(s) in 1986 (position) are significant factor(s) to predict 1987 salary (in $ Thousands) (salary). [Hint: use PROC GLM.]