Use the given degree of confidence and sample data to construct a confidence interval for the population mean . Assume that the population has a normal distribution. Show your work.

n = 30, x = 89.3, s = 18.9, 90 percent

A) (79.79, 98.81)

B) (82.24, 96.36)

C) (83.47, 95.13)

D) (83.44, 95.16)