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

a. What is the gross revenue expected for a week when $3500 is spent on television advertising (x1 3.5) and $1800 is spent on newspaper advertising (x2 1.8)?

b. Provide a 95% confidence interval for the mean revenue of all weeks with the expenditures listed in part (a).

c. Provide a 95% prediction interval for next week’s revenue, assuming that the advertising expenditures will be allocated as in part (a).