4. The accompanying table shows the manufacturer's suggested retail price (MSRP), the highway miles per gallon (mpg), and the weight for each case in two different samples of vehicles. The top half of the table shows a random sample of five models of family sedans (which rules out luxury cars, sport cars, and convertibles), and the bottom half shows a simple random sample of five models of sport utility vehicles (SUVs). 2 a. Estimate the difference in mean model price between family sedans and SUVs and an approximate 95% confidence interval. b. Estimate the difference in mean model weight between family sedans and SUVs and an approximate 95% confidence interval. c. Estimate the difference in mean highway mpg between family sedans and SUVs and an approximate 95% confidence interval. d. In which of the confidence intervals in this exercise do you have the least "confidence"? Explain. MSRP Sedans (dollars) Mpg highway Weight (pounds) Buick Century Custom 20,020 29 3368 Chevrolet Malibu 17,150 29 3051 Chrysler Concorde LX 22,510 28 Ford Taurus LX 18,550 27 Toyota Camry LE 20,415 32 812 3488 3354 3120 SUVs Blazer 4WD LX 26,905 Explorer AWD XLT 30,185 Jimmy 4WD SLT 30,225 Trooper S 4 x 4 27,920 Grand Cherokee 4WD 35,095 22222 20 4049 19 4278 20 4170 19 4465 20 4024