An experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual income. The sample mean is computed to be $35,420. If the population 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

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated by dividing the population standard deviation by the square root of the sample size: $ \frac{2050}{\sqrt{256}} = \frac{2050}{16} = 128.125 $.

An Experiment Involves Selecting a Random Sample of 256 Middle