Chapter 10.3, Problem 15E

Using Technology. In Exercises 15–18, use software to conduct an analysis of variance.

1. 15. Head Injury in Car Crashes. In car crash experiments conducted by the National Transportation Safety Administration, new cars were purchased and crashed into a fixed barrier at 35 miles per hour. The subcompact cars were the Ford Escort, Honda Civic, Hyundai Accent, Nissan Sentra, and Saturn SL4. The compact cars were the Chevrolet Cavalier, Dodge Neon, Mazda 626 DX, Pontiac Sunfire, and Subaru Legacy. The midsize cars were the Chevrolet Camaro, Dodge Intrepid, Ford Mustang, Honda Accord, and Volvo S70. The full-size cars were the Audi A8, Cadillac Deville, Ford Crown Victoria, Oldsmobile Aurora, and Pontiac Bonneville. Head injury data (in hic) for the dummies in the driver’s seat are listed below. We can assume the populations to be normally distributed. Use a 0.05 significance level to test the null hypothesis that the different size categories have the same means. Do the sample data suggest that larger cars are safer?