Does the Weight of a Car Affect Leg Injuries in a Crash? Data were obtained from car crash experiments conducted by the National Transportation Safety Administration. New cars were purchased and crashed into a fixed barrier at 35 mi h, and measurements were recorded for the dummy in the driver’s seat. Use the sample data listed below to test for differences in left femur load measurements (in lb) among the four weight categories. Is there sufficient evidence to conclude that leg injury measurements for the four car weight categories are not all the same? Do the data suggest that heavier cars are safer in a crash?

Subcompact: 595 1063 885 519 422 Compact: 1051 1193 946 984 584 Midsize: 629 1686 880 181 645 Full-size: 1085 971 996 804 1376