The following data were collected in a clinical trial

Question

Need to seT 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
Treatment	0-25%	26-50%	51-75%	76-100%
New Compound ()	15	37	32	41
Placebo ()	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.

 

                    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 Healing	Total
Treatment	0-25%	26-50%	51-75%	76-100%
New Compound	15 (   )	37 (   )	32 (   )	41 (   )	125
Placebo	36 (   )	45 (   )	34 (   )	10 (   )	125
Total	51	82	66	51	250

Compute  χ².

             χ²₌ ________

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

• We have statistically significant evidence at .05 to show that H₀ is false.
• Treatment and percent wound healing are not independent.
• Treatment and percent wound healing are independent.
• a and b.