A clinical trial is conducted to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo.
A clinical trial is conducted to investigate the effectiveness of
an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or placebo. Women are followed through delivery and classified as delivering preterm (<37 weeks) or not. The data are shown below.
Is there a statistically significant difference in the proportions of women delivering preterm among the three treatment groups? Apply the test at a 5% level of significance.
1. df:
2. Critical Value:
3. Computed t Value:
4. Based on comparing the computed Chi Square value with the critical value for Chi Square which of the following is (are) true?
A. There IS statistically significant difference in the proportions of women delivering preterm among the three treatment groups.
B. There is NOT statistically significant difference in the proportions of women delivering preterm among the three treatment groups.
C. The proportions are statistically the same.
D. A & C.
Preterm delivery||||||| |||||||Experimental drug||||||||| ||||||||Standard drug ||||| |||||| Placebo
Yes 17 23 35
No 83 77 65
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