A clinical trial is run 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? Run the test at a 5% level of significance. 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of thetest statistic; and 5) your conclusion including a comparison to alpha or the critical valuE.

Preterm Delivery

Yes No Total

experimental drug 7 33 40

standard drug 13 32 45

placebo 17 18 35

Total 37 83 120

Can you please help. I am confused and need to see how you do each step (5 questions above) to figure it out.

Thank you