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

Question

Can you help me complete the bottom chart and compute X2 of my homework assignment? I know df is 125-1=124. Thank you.

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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Transcribed Image Text

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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