An Auditor for a Large Oil Corporation Has Taken a Random

Multiple Choice

An auditor for a large oil corporation has taken a random sample of monthly credit card charges for 32 individual (non-corporate) accounts.She found a mean of $81.76.Assume that the population standard deviation is 48.2.A 98% confidence interval estimate for the population mean of individual credit card charges would be:

A) 81.76 $\pm$ 19.89.
B) 81.76 $\pm$ 16.72.
C) 81.76 $\pm$ 112.94.
D) 81.76 $\pm$ 22.0.
E) 81.76 $\pm$ 2.33.