Solution for QID #20763: The?quality-control manager at a compact fluorescent light b | StudyHelpMe

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 7,549 hours. The population standard deviation is 700 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,399 hours. a)At the 0.05 level of? significance, is there evidence that the mean life is different from 7,549 hours? b) Compute the? p-value and interpret its meaning. c) Construct a 95?% confidence interval estimate of the population mean life of the light bulbs. d) Compare the results of? (a) and? (c). What conclusions do you? reach?