A clinical trial is conducted to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnancy women are enrolled and randomly assigned to receive the experiment drug, the standard drug or placebo. Women are followed through delivery and classified as delivering preterm (<37weeks) 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.
1) Do
2) Critical Value
3) Computed Value