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) 1440.
D) 10.

Question

Quizplus · Accepted Answer

The formula for standard error of the mean is standard deviation divided by the square root of sample size. Therefore, the standard error of the mean is 120/√144 which simplifies to 10. Option D is the only choice that matches this calculation.

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