A sample of n = 25 is selected at random from a population with a σ = 15. Approximately how much difference in the scores would you expect between the sample mean and the population mean?
A) 15 points
B) 1.67 points
C) 3 points
D) .6 point

Question

Quizplus · Accepted Answer

The standard error of the mean (SEM) is σ/√n = 15/√25 = 3. Therefore, we can expect the sample mean to differ from the population mean by approximately 3 points.

A Sample of N = 25 Is Selected at Random