A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is _____.
A) 1.875
B) 40
C) 5
D) 15

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated as the population standard deviation divided by the square root of the sample size: 120 / √64 = 120 / 8 = 15.

A Simple Random Sample of 64 Observations Was Taken from a Large