The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,500 hours. The population standard deviation is 1,000 hours. A random sample of 64 CFLs indicates a sample mean life of 7,250. 23. At the 0.01 level of significance, is there strong evidence that the mean life is different from 7,500 hours? (a) Yes (b) No (c) We don’t have enough information to decide

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