A clinical trial is conducted to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug consigned 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 delivery preterm (>37 weeks) or not The data are shown below.
Is there a statistically significant difference in the proportions of women delivery preterm among the THREE treatments groups? Apply the test of 5% level of significance.
1 df =
2. critical value =
3. computed value =
4. based on comparing the computed chi square with the critical values for the 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 treatments groups (b) there is not statistically significant difference in the proportions of women delivering preterm among the three treatments groups (c) the proportion are statistically the same (d) a and c
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