Need assistance with calculating in Excel ONLY, when applicable. New to this concept, need an elementary explanation to help grasp. Again, need help with calculating in Excel( Formulas). Thank you!

The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean of life of a large shipment of CFL's is equal to 7,500 hours. The population standard deviation is 1,000. A random sample of 64 CFL's indicates a sample mean life of 7,250 hours.

A)At the 0.05 level of significance, is there evidence that the mean life is different from 7,500 hours?

B)Compute the p-value and interpret its meaning?

C)Construct a 95% confidence interval estimate of the population mean life of the CFL's.

D)Compare the results of (A) and (C). What conclusions do you reach?