7.9 PRACTICE PROBLEMS 1. Data are collected in a clinical trial evaluating a new compound designed to improve wound healing in trauma patients. The new compound is compared against a placebo. After treatment for 5 days with the new compound or placebo, the extent of wound heal- ing is measured and the data are shown in Table 7-6. Is there a difference in the extent of wound healing by TABLE -6 Data for Practice Problems 1 and 2 Percent Wound Healing Treatment 0-25% 26-50% 51-75% 76-100% New compound (n = 125) 15 37 32 41 Placebo (n = 125) 36 45 34 10

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