In order to fairly set the flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to

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answerhappygod
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In order to fairly set the flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to

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In order to fairly set the flat rates for auto mechanics, a shopforeman needs to estimate the average time it takes to replace afuel pump in a car. How large the sample must be selected if hewants to be 95 % confident that the average time is within 15minutes of the sample average. Assume that the sample standarddeviation of all times is 34 minutes The group chooses theanswer:
A.100
B.75
C.20
D.50
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