An estimate of the time required to perform a certain job, Business Economics

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An estimate of the time required to perform a certain job

An estimate of the time required to perform a certain job is needed. The study yielded a mean of 6.4 minutes and a standard deviation of 2.1 minutes. The desired confidence is 0.95. How many observations will be needed if the desired maximum error is:

a. +or – 10% of the sample mean

b. ½ minute

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