Find evidence that the mean life is different

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The quality-control director at a light bulb factory wants to determine if the mean life of a large shipment of bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 bulbs indicates the mean is 350 hours. At the .05 is there evidence that the mean life is different than 375 hours?

Reference no: EM13124095

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