You want to estimate σ for the population of waiting times at McDonald's drive-up windows, and you want to be 95% confident that the sample standard deviation is with 20% of σ. Find
the minimum sample size. Is this sample size practical?

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The Answer of You want to estimate σ for the population of waiting times at McDonald's drive-up windows, and you want to be 95% confident that the sample standard deviation is with 20% of σ. Find
the minimum sample size. Is this sample size practical?

You Want to Estimate σ for the Population of Waiting