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 comma 454 hours. the population standard deviation is 1 comma 080 hours. a random sample of 81 light bulbs indicates a sample mean life of 7 comma 154 hours.
a. at the 0.05 level of significance, is there evidence that the mean life is different from 7 comma 454 hours question mark
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