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You Want to Estimateσ for the Population of Waiting Times σ\sigma

Question 40

Essay

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\sigma Find the minimum sample size. Is this
sample size practical?

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The sample size of 48 is very ...

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