From the formula for the standard error of the mean, it is apparent that variation among sample means will be decreased when
A) variation among scores in the population is less
B) sample size is larger
C) either (or both) of the above occurs
D) sampling is done with replacement

Question

Quizplus · Accepted Answer

The standard error of the mean decreases when the population variance is smaller or the sample size is larger, as both factors reduce variability among sample means.

From the Formula for the Standard Error of the Mean