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25-11-2022
Mathematics

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to determine whether they need to hire extra help for the holiday season, the managers of a railroad company want to estimate how long, on average, it takes a crew to unload a freight car at the lafayette station. they will calculate an estimator as the sample mean of a random sample of unloading times. the managers want the sample mean to have a standard error of 2 minutes or less. the corporate office has provided a standard deviation of 13 minutes to use for calculation purposes. how large should the random sample be to ensure the sample mean has the desired standard error? enter an integer in the box below.

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