A manager at SmallBell, a small telephone company, wants to determine how long service technicians need to
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Question:
A manager at SmallBell, a small telephone company, wants to determine how long service technicians need to perform a certain repair. In the past, an almost identical repair required 22.75 minutes, with a standard deviation of 0.3 minutes. Compute the sample size of times needing to be collected to ensure that they can be 90 percent confident of correctly estimating the repair time if the manager is willing to tolerate an error rate of 0.04. Explain your answer.
Related Book For
Elementary Statistics in Social Research Essentials
ISBN: 9780205638000
3rd edition
Authors: Jack A. Levin, James Alan Fox
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