[Solution] The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic
Question: The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic component. After observing a number of workers assembling similar devices, she guesses that the standard deviation is 6 minutes. How large a sample of workers should she take if she wishes to estimate the mean assembly time within 20 seconds? Assume that the confidence level is to be 99%.
Deliverable: Word Document 
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Confidence Interval Calculator for the Mean (Known Population Standard Deviation) - MathCracker.com