A simple random sample of 144 observations was taken from a large population. The sample mean and the standard deviation were determined to be 1234 and 120 respectively. The standard error of the mean is
A)1234±120
B)120
C)120*12=1440
D)10

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated using the formula: standard deviation / square root of sample size.

standard error of the mean = 120 / sqrt(144) = 10. Therefore, the answer is D) 10.

A Simple Random Sample of 144 Observations Was Taken from a Large