Listed below are measured loads (in lb) on the left femur of crash test dummies. (The data are from the same cars used in the Chapter Problem for Chapter 12.) Use a 0.05 significance level to test the null hypothesis that the different car categories have the same median. 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