4.2 The quality control manager at a light bulb factory needs to determine whether the mean life of.
4.2 The quality control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 326 hours. The population standard deviation is 80 hours random sample of 81 light bulbs indicates a sample mean of 315 hours. At 0.05 level of significance, is there evidence that the mean life is different from 326 hours? (5) May 16 2022 05:45 PM
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