(Answered) The manager who implemented the change on the order picking

Statistics

The manager who implemented the change on the order picking process for medium items wants to be certain of the margin of error. Assume that the standard deviation is known and it's equal to 3. How large should the sample be as to have a margin of error of 2 minutes with a confidence level of 99%. How large should the sample be to have a margin of error of 1 minute

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