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.
Answer to relevant QuestionsRepeat Exercise 15.27, but with average retail units sold per dealer as the independent variable and with the 95% interval estimates assuming a dealer group for which the average number of retail units sold per dealer is ...For the data in Exercise 15.23, and with y = touchdown percentage and x = interception percentage, determine and interpret the coefficients of correlation and determination. In exercise For each of 10 popular prescription drugs, file XR15042 lists the retail price (in U.S. dollars) for the drug in several different countries, including the United States, Canada, Great Britain, and Australia. Determine and ...For the regression line developed in Exercise 15.38, a. Use the 0.05 level in testing whether the population coefficient of correlation could be zero. b. Use the 0.05 level in testing whether the population regression ...Computer database GROWCO describes the characteristics of 100 companies identified by Fortune as the fastest growing. Two of the variables listed are revenue and net income (millions of dollars) for the most recent four ...
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