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. Give each of the following 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value. Preterm Delivery Total Yes No Experimental Drug Standard Drug Placebo Total 33 40 32 45 13 18 17 35 37 83 120

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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. Give each of the following
1) the appropriate null and alternative hypotheses; 2)
the appropriate test; 3) the decision rule; 4) the calculation of the test
statistic; and 5) your conclusion including a comparison to alpha or the
critical value.
Preterm Delivery
Total
Yes
No
Experimental Drug
Standard Drug
Placebo
Total
33
40
32
45
13
18
17
35
37
83
120
Transcribed Image Text: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. Give each of the following 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value. Preterm Delivery Total Yes No Experimental Drug Standard Drug Placebo Total 33 40 32 45 13 18 17 35 37 83 120
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