*Need help A through D*

Thequality-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 7,524 hours. The population standard deviation is 92hours. A random sample of 64 light bulbs indicates a sample mean life of 7,501 hours.

a. At the 0.05 level ofsignificance, is there evidence that the mean life is different from 7,524hours?

b. Compute thep-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 youreach?

a. Let be the population mean. Determine the nullhypothesis, H0, and the alternativehypothesis, H1.

H0: =

nothing

H1:

nothing