Information describing 98 of the top automobile dealership groups in the United States is provided in computer database file DEALERS. For calendar year 1999, the data include the number of dealers, the average number of retail units sold per dealer, and the total revenue for the dealership group. Determine the regression equation estimating total revenue as a function of the number of dealers. For a dealership group consisting of 100 dealers, determine and interpret the 95% confidence and prediction intervals associated with total revenue.