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We are concerned that the hours might be higher or lower

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The depot is using a standard of 635 hours for a particular modification effort. YOu are to review the standard and determine whethere 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 635 hour standared. Test the standard at the .05 level of significance.

Reference no: EM13578519

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