Question: A time study analyst wants to estimate the time required to perform a certain job. A preliminary study yielded a mean of 7.2 minutes and

A time study analyst wants to estimate the time required to perform a certain job. A preliminary study yielded a mean of 7.2 minutes and a standard deviation of 1.8 minutes. The desired confidence is 95 percent (z=1.96). How many observations will be needed if the desired maximum error is

_______________ 10 percent of the sample mean

_______________One-half minute

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