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Test whether the operation is meeting Mean completion time

An automobile assembly line operation has a scheduled mean completion time of 2.2 minutes. Because of the effect of completion time on both preceding and subsequent assembly operations, it is important to maintain the 2.2 minute mean completion time. A random sample of 45 assemblies resulted in the completion times shown in the Excel spreadsheet Problem 2. Use alpha= .02 and test whether the operation is meeting its 2.2 minute mean completion time.

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