Question: In designing a new machine to be used on an assembly line at a General Motors plant, an engineer obtains measurements of arm-lengths of a

In designing a new machine to be used on an assembly line at a General Motors plant, an engineer obtains measurements of arm-lengths of a random sample of male machine operators. The following values (in centimetres) are obtained. Construct the 95% confidence interval for the mean arm length of all such employees.

76.8 75.6 69.3 75.7 75.5 71.2 72.5 71.9 70.9 69.4 71.7 72.5 72.2 68.5 75.9 73.0

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