Exhibit 8-1 in Order to Estimate the Average Time Spent on the on the Computer

Multiple Choice

Exhibit 8-1
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours.
-Refer to Exhibit 8-1. The standard error of the mean is

A) 7.5
B) 0.014
C) 0.160
D) 0.133