An experiment involves selecting a random sample of 256 middle managers at random for study. One item of interest is their mean annual income. The sample mean is computed to be $35,420 and the sample standard deviation is $2,050. What is the standard error of the mean?
A) $128.125
B) $138.36
C) $2,050
D) $8.01
E) None of the choices are correct

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated by dividing the sample standard deviation by the square root of the sample size: $2,050 / √256 = $128.125.

An Experiment Involves Selecting a Random Sample of 256 Middle