Fit a multiple linear regression model with response variable, Y, the five quantitative predictor variables, X1-X5, and the two indicator predictor variables, DS and DW. Briefly describe in a few sentences the fit of this model (e.g., which predictor terms appear to be relevant, whether the model fits well overall, whether and how the model could be improved). [For this initial model and all subsequent models, enter all predictor terms as "continuous predictors" and do not use the categorical predictor variable, Region. This initial model should have seven predictor terms.]