The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean ife of a large shipment of CFLS is equal to 7,476.hours. The population standard deviation is 900 hours. A random sample of 81 light bulbs indicates a sample mean ife of 7,226 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,476 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?

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