2. A recent study of smoking cessation programs collected information about nicotine replacement therapies that people were using to try to quit smoking. The main nicotine replacement therapies were a nicotine patch, nicotine gum, and nicotine lozenges. Some people did not use any nicotine replacement therapies. Use the Venn diagram of this data to answer some questions about the smoking cessation programs. Patch 661 None 86 60 40 106 239 102 172 Lozenge Gum
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We need to find the probability that a person tried to quit smoking using a lozenge given that they also use gum. This is a conditional probability problem. Show more…
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The data in the following table show the results of a national study of 137,243 U.S. men that investigated the association between cigar smoking and death from cancer. Note: Current cigar smoker means "cigar smoker at time of death." $$\begin{array}{|l|c|}\hline & \text { Died from cancer } & \text { Did not die from cancer } \\ \hline \text { Never smoked cigars } & 782 & 120,747 \\\hline \text { Former cigar smoker } & 91 & 7,757 \\ \hline \text { Current cigar smoker } & 141 & 7,725 \\\hline\end{array}$$ (a) What is the probability that a randomly selected individual from the study who died from cancer was a former cigar smoker? (b) What is the probability that a randomly selected individual from the study who was a former cigar smoker died from cancer?
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A new chewing gum has been developed that is helpful to those who want to stop smoking. If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
Nicotine Lozenge An experiment investigated the effectiveness of a nicotine lozenge for subjects who wanted to quit smoking (Shiffman et al., 2002). Before the treatments began, subjects answered background questions, including how many cigarettes they smoked per day. Among the 1818 subjects in the study, the average was 22.0 cigarettes per day, and the standard deviation was 10.8 cigarettes per day. a. Identify the population and parameter of interest. Population of interest: Parameter of interest: b. Produce a 95 % confidence interval for the population mean number of cigarettes smoked per day. Round your answers to four decimal places. ( , ) c. Based on this interval, does it seem plausible to assert that the population mean is 20 cigarettes (one pack) per day?
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