A random sample of 250 third graders scored an average of 3.2 on a standardized reading test. The standard deviation was 0.95. What is the standard error of the sample mean?
A) 0.95
B) 0.202
C) 0.0038
D) 0.060

Question

Quizplus · Accepted Answer

The standard error of the sample mean is calculated by dividing the standard deviation by the square root of the sample size: SE = 0.95 / √250 ≈ 0.060.

A Random Sample of 250 Third Graders Scored an Average