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

Question

Quizplus · Accepted Answer

The formula for calculating the standard error of the mean is
standard error of the mean = population standard deviation / square root of sample size.
Substituting the values given, we get
standard error of the mean = 1.2 / square root of 81 = 0.133. Therefore, the best choice is D.

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