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Determine the mean life of a large shipment

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Q: The quality-control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of lightbulbs is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 lightbulbs indicates a sample mean life of 350 hours

a. State the null and alternative hypothesis

b. At the 0.05 level of significance is there evidence that the mean life is different from 375 hours?

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Basic Statistics: Determine the mean life of a large shipment

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