Next Question ,507 hours. The population standard deviation is 700 hours. A random The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment 49 light bulbs indicates a sample mean life of 7,357 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,507 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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