11.30 A simpler model. In the multiple regression analysis using all four explanatory variables, Theaters and Budget appear to be the least helpful (given that the other two explanatory variables are in the model).
(a) Perform a new analysis using only the movie’s openin
g- weekend revenue and IMDb rating. Give the estimated regression equation for this analysis. (b) What percent of the variability in USRevenue is explained by this model?
(c) Test the null hypothesis that Theaters and Budget combined add no additional predictive information beyond what is already contained in Opening and Opinion?