Calculate a mean of 665 hours and a standard deviation

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Question:

The depot is using a standard of 650 hours for a particular modification effort.

You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications you calculate a mean of 665 hours and a standard deviation of 45 hours.

We are concerned that the hours might be higher or lower than the 650 hour standard. Test the standard at the .05 level of significance.

Reference no: EM131259414

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