Listed below are measured loads (in lb) on the left femur of crash test dummies used in the same cars listed in the Chapter Problem. Use a 0.05 significance level to test the null hypothesis that the different car categories have the same mean. Do these data suggest that larger cars are safer?

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Small Cars 548 782 1188 707 324 320 634 501 274 437 Medium Cars 194 280 1076 411 617 133 719 656 874 445 Large Cars 215 937 953 1636 937 472 882 562 656 433