please help me with this question

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 7.541 hours. The population standard deviation is 700 hours: A random sample of 49 light bulbs indicates a sample mean life of 7,391 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,541 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