In exercise 5, the owner of Showtime Movie Theaters, Inc., used multiple regression analysis to predict gross revenue ( y) as a function of television advertising (x1) and newspaper advertising (x2). The estimated regression equation was The computer solution provided SST 25.5 and SSR 23.435.

a. Compute and interpret R2 and .

b. When television advertising was the only independent variable, R2 .653 and

.595. Do you prefer the multiple regression results? Explain.