Question: A clinical trial evaluated a new compound designed to improve wound healing in trauma patients. The new compound was compared against a placebo. After treatment for 5 days with the new compound or placebo, the extent of wound healing was measured and the data are show in Table 7.45. Is there a difference in the extent of wound healing by treatment? Run the appropriate test at a 5% level of significance. (hint: are treatment and the percent of wound healing independent?)

Table 7.45

Treatment 0-25 26-50 51-75 76-100

New compound 15 37 32 41

(n= 125)

Placebo (n=125) 36 45 34 10