If the standard deviation for a sample of 225 consumers is 20, then the standard error of the mean for this sample is approximately:
A) 0.09.
B) 0.75.
C) 1.33.
D) 1.78.

Question

Quizplus · Accepted Answer

The formula for standard error of the mean is standard deviation/square root of sample size. So, in this case, the standard error of the mean would be 20/sqrt(225) = 20/15 = 1.33. Therefore, the best choice is C.

If the Standard Deviation for a Sample of 225 Consumers