Question

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 a placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or a placebo. Women are followed through delivery and classified as delivering preterm (< 37 weeks) or not. The data are shown below. (HINT: expected frequency for preterm delivery should be consistent across the three groups – 25 per group, and expected frequency for no preterm delivery should also be consistent across the three groups)

Preterm Delivery	Experimental Drug	Standard Drug	Placebo
Yes	17	23	35
No	83	77	65

Is there a statistically significant difference in the proportions of women delivering preterm among the three treatment groups? (α = 0.05, enter 1 for “yes”, and 0 for “no”).

41. What is the value of the test statistic you computed for Q40? (round to 2 decimal places)

           

42. What is the critical value for the test you performed in Q40? (2 decimal places

Answer 1