A company claim that the mean life and standard deviation, Operation Management

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A company claim that the mean life and standard deviation

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A company claim that the mean life and standard deviation of the bulbs are 360 hours and 90 hours respectively. A sample of 625 bulbs is chosen. It is found that the mean life and standard deviation of the bulb in the sample are 355 hour and 90 hours respectively. Use these results to test the claim at the 5% level of significance

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Operation Management: A company claim that the mean life and standard deviation

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Operation Management: A company claim that the mean life and standard deviation

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