nical 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.

 

Preterm Delivery Experimental drug Standard drug Placebo

Yes 17 23 35

No 83 77 65

 

df:

critical value:

computed value:

Based on comparing the computed Chi Square value with the critical value for Chi Square which of the following are true?

a. There is statically significant difference in the proportions of women delivering preterm among the three treatments groups.

b. There is not statistically significant difference in the proportion of women deliveringpreterm among the three treatment groups

c. The proportions are statistically the same.

d. a and c

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