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Question

Need to see the work breakdown for this question and answer to the multiple choice after.  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 placebo.  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
Treatment0-25%26-50%51-75%76-100%
New Compound ()15373241
Placebo ()36453410

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.

                    df= ________

               alpha= ________

 Reject H0 if χ2>________

Compute expected frequencies

Expected Frequency = (Row Total * Column Total)/N.

Complete the expected frequencies for each cell.

Percent Wound HealingTotal
Treatment0-25%26-50%51-75%76-100%
New Compound 15(   )37(   )32(   )41(   )125
Placebo 36(   )45(   )34(   )10(   )125
Total51826651250

Compute  χ2.

             χ2= ________

Based on comparing the computed χ2 to the rejection level χ2 which of the following is (are) true?

 
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