(Answered) The depot is using a standard of 635 hours for a particular

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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.

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