A group of physicians from Denmark conducted a year-long studyof the effectiveness of nicotine chewing gum in helping people stopsmoking. The 113 people who participated in the study were allsmokers. Of these, 60 were given a chewing gum with 2 mg ofnicotine, and 53 were given a placebo chewing gum with no nicotine.This was a randomized controlled study. All were told to use thegum and refrain from smoking. Results showed that 23 of the smokersgiven the nicotine chewing gum had remained nonsmokers for the1-year period while 12 of the smokers given the placebo hadremained nonsmokers during the same period. Do these resultssupport the conclusion that nicotine gum can help stop smoking?Test at α = 0.05.
1-Hypothesis test for one population mean (unknown populationstandard deviation)
2-Confidence interval estimate for one population mean (unknownpopulation standard deviation)
3-Hypothesis test for population mean from paireddifferences
4-Confidence interval estimate for population mean from paireddifferences
5-Hypothesis test for difference in population means from twoindependent samples
6-Confidence interval estimate for difference in populationmeans from two independent samples
7-Hypothesis test for one population proportion
8-Confidence interval estimate for one population proportion
9-Hypothesis test for difference between two populationproportions
10-Confidence interval estimate for difference between twopopulation proportions
In developing patient appointment schedules, a medical centerwants to compare the mean time that staff members spend withpatients between two offices--one in Cleveland and one inCincinnati. A random sample of 30 office visits is taken from eachoffice. Estimate the difference with a 95% level of confidence.
1-Hypothesis test for one population mean (unknown populationstandard deviation)
2-Confidence interval estimate for one population mean (unknownpopulation standard deviation)
3-Hypothesis test for population mean from paireddifferences
4-Confidence interval estimate for population mean from paireddifferences
5-Hypothesis test for difference in population means from twoindependent samples
6-Confidence interval estimate for difference in populationmeans from two independent samples
7-Hypothesis test for one population proportion
8-Confidence interval estimate for one population proportion
9-Hypothesis test for difference between two populationproportions
10-Confidence interval estimate for difference between twopopulation proportions
