Question

On March 4, 1999, the New England Journal of Medicine published a research article by Dr. Douglas Jorenby and colleagues comparing different treatments to help patients stop smoking. The four treatments were: a placebo, a nicotine patch, Zyban, and both Zyban and a nicotine patch. The subjects were treated and the number of subjects not smoking after 6 months was recorded. The results are summarized in the table below: Treatment Subjects participating Subjects not smoking After Six Months Placebo 160 30 Nicotine Patch 244 52 Zyban 244 85 Zyban and nicotine patch 245 95 1. Compute the sample proportion of successes for each group. Rank the four treatments in order of effectiveness (most effective to least effective). (5 pts.) 2. Calculate the 95% confidence interval for: a. The proportion of patients using Zyban who were not smoking 6 months later. Show all work. Round to 4 decimal places. (11 pts.) b. The proportion of patients using Zyban and a nicotine patch who were not smoking 6 months later. Show all work. Round to 4 decimal places. (11 pts.)

          On March 4, 1999, the New England Journal of Medicine published a research article by Dr. Douglas
Jorenby and colleagues comparing different treatments to help patients stop smoking. The four
treatments were: a placebo, a nicotine patch, Zyban, and both Zyban and a nicotine patch. The subjects
were treated and the number of subjects not smoking after 6 months was recorded. The results are
summarized in the table below:
Treatment Subjects participating Subjects not smoking After Six Months
Placebo 160 30
Nicotine Patch 244 52
Zyban 244 85
Zyban and nicotine patch 245 95
1. Compute the sample proportion of successes for each group. Rank the four treatments in order
of effectiveness (most effective to least effective). (5 pts.)
2. Calculate the 95% confidence interval for:
a. The proportion of patients using Zyban who were not smoking 6 months later. Show all
work. Round to 4 decimal places. (11 pts.)
b. The proportion of patients using Zyban and a nicotine patch who were not smoking 6
months later. Show all work. Round to 4 decimal places. (11 pts.)

On March 4, 1999, the New England Journal of Medicine published a research article by Dr. Douglas
Jorenby and colleagues comparing different treatments to help patients stop smoking. The four
treatments were: a placebo, a nicotine patch, Zyban, and both Zyban and a nicotine patch. The subjects
were treated and the number of subjects not smoking after 6 months was recorded. The results are
summarized in the table below:
Treatment Subjects participating Subjects not smoking After Six Months
Placebo 160 30
Nicotine Patch 244 52
Zyban 244 85
Zyban and nicotine patch 245 95
1. Compute the sample proportion of successes for each group. Rank the four treatments in order
of effectiveness (most effective to least effective). (5 pts.)
2. Calculate the 95% confidence interval for:
a. The proportion of patients using Zyban who were not smoking 6 months later. Show all
work. Round to 4 decimal places. (11 pts.)
b. The proportion of patients using Zyban and a nicotine patch who were not smoking 6
months later. Show all work. Round to 4 decimal places. (11 pts.)

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