c. One can be 9570 Commuo limit. D. a and b 2. The following data were collected in a clinical trial evaluating a new compound designed to improve wound healing in trauma patients. The new compound is compared against a placeb0. After treatment for 5 days with the new compound or placebo the extent of wound healing is measured and the data are shown below. Percent Wound Healing Treatment New Compound (n-125) Placebo (n-125) 0-25% 15 36 26.50% | 51-75% | 76-100% 32 37 45 34 Is there a difference in the extent of wound healing by treatment? Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level ofsignificance. df- alpha 5 2 17 ) Reject Ho ifX2 Compute expected frequencies Expected Frequency (Row Total * Column Total)/N. Complete the expected frequencies for each cell. Percent Wound Healing Total 125 125 250 Treatment 0-25% | 26-50% 51-75% 32 76-100% 41 New Compound Placebo Total 15 36 51 37 45 82 34 10 Compute χ2. (27.2) 28.32 Based on comparing the computed χ2 to the rejection level χ2 which of the following is (are) true? We have statistically significant evidence at alpha-0.05 to show that Ho is false. A. B. Treatment and percent wound healing are not independent. C. Treatment and percent wound healing are independent. D. a and b. Page 2 of 3

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