Consider an infinite population with a mean of 160 and a standard deviation of 25. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals:
A)12.649.
B)25.0.
C)2.56.
D)3.125.

Question

Quizplus · Accepted Answer

The standard deviation of the sample mean (standard error) is calculated by dividing the population standard deviation by the square root of the sample size: 25 / √64 = 3.125.

Consider an Infinite Population with a Mean of 160 and a Standard