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March 24, 2017

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4. Assume you are just planning this survey and want to know how many individuals you have to randomly select to be part of the sample. Assume that the purpose of the study is to calculate a 95% confidence interval for proportion of the adult population who favor lowering the drinking age to 18, such that the margin of error is only 0.03 (or 3% ). We don’t have any idea about what the value of p (the proportion in the population) might be. Calculate the necessary sample size.

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