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 7,472 hours. The population standard deviation is 900 hours. A random sample of 81 light bulbs indicates a sample mean life of 7,222 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,472 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? a. Let u be the population mean. Determine the null hypothesis, Ho, and the alternative hypothesis, H, Ho:H=

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