A9. Suppose we used a crossover design to test for differences in bruising from subcutaneous sodium heparin injections at three sites (arm, leg, and abdomen) in a sample of 15 medical–surgical...

A9. Suppose we used a crossover design to test for differences in bruising from subcutaneous sodium heparin injections at three sites (arm, leg, and abdomen) in a sample of 15 medical–surgical patients. Surface area of the bruises (in mm2 ) is measured 72 hours after each injection, which are administered to sites in random order at 8-hour intervals. Use the following information to compute the F statistic to determine if there were significant differences in bruising by site, at the .05 level: