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.

(a) 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.

(b) Assume that the study uses your sample size recommendation in part (b) & finds 520 smokers. What is the point estimate of the population of smokers in the population?

(c) What is the 95% confidence interval for the population of smokers in the population.