A random sample of 25,000 ACT test takers had an average score of 21 with a standard deviation of 5. Determine the standard error.
A) .0230
B) .0316
C) .1328
D) .0141

Question

Quizplus · Accepted Answer

The formula for standard error is standard deviation divided by the square root of sample size. So, in this case, the standard error would be 5 / sqrt(25,000) = 0.0316. Therefore, the correct choice is B.

A Random Sample of 25,000 ACT Test Takers Had an Average