The following data was collected in a clinical trial evaluating

The following data was collected in a clinical trial evaluating

4. The following data was collected in a clinical trial evaluating a new medication designed to improve wound healing in trauma patients.  The new compound is compared against a placebo.  After treatment for 10 days with the new compound or placebo the extent of wound healing is measured and the data are shown below.

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Percent Wound Healing

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

New psoriasis medication (n=125) 15 37 32 41

Placebo (n=125) 36 45 34 10

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 of significance.

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