How many families must you survey if you want to be 99 sure


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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Financial Management: How many families must you survey if you want to be 99 sure
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