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

Question 36

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?

Correct Answer:

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The sample size of 48 is very ...

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