Run a regression model with "Sales" as the response variable, and "Temperature," "Advertising," and "Discount," as the predictor variables. $(1$ point$)$

Comments on the results. $(1$ points$)$

Drop one variable at a time and see which model provides the best fit based on adjusted$-$R$2.(1$ point$)$

Repeat Part C$.$ Which model provides the best fit based on F$-$test. $(1$ point$)$