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[Solution Library] 2003 stats of people 18 years of age or older who smoke. Suppose study was designed to collect new data on smokers and nonsmokers uses a preliminary

Question: 2003 stats of people 18 years of age or older who smoke. Suppose study was designed to collect new data on smokers and nonsmokers uses a preliminary estimate the proportion of smokers who smoke of .30.

  1. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02? Use 95% confidence.
  2. Assume that the study uses your sample size recommendation in part (a) & finds 520 smokers. What is the point estimate of the population of smokers in the population?
  3. What is the 95% confidence interval for the population of smokers in the population.

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