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The Statistical Abstract of the United States reported the percentage of people age 18 years of age and older who smoke. Suppose that a study

The Statistical Abstract of the United States reported the percentage of people age 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 0.12. How large a sample should be taken to estimate the actual proportion of smokers with a margin of error of 0.02? Use a confidence coefficient of 0.90.

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