Solved: In past years approximately 20 of all us families purchased, Basic Statistics

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In past years approximately 20 of all us families purchased

Question: In past years, approximately 20% of all U.S. families purchased potato chips at least once a month. You are interested in determining the fraction of all U.S. families that currently purchase potato chips at least once a month. How many families must you survey if you want to be 99% sure that your estimate of the relevant proportion is accurate within 2%?

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