If a normal population has parameters μ = 40 and σ = 8, then for a sample size n = 4:
A)the standard error of the sample mean is approximately 2.
B)the standard error of the sample mean is approximately 4.
C)the standard error of the sample mean is approximately 8.
D)the standard error of the sample mean is approximately 10.

Question

Quizplus · Accepted Answer

The formula for calculating the standard error (SE) of the sample mean is SE = σ/√n. 
Plug in the given values and we get:
SE = 8/√4 = 8/2 = 4
Therefore, the standard error of the sample mean for a sample size of 4 is approximately 4.

If a Normal Population Has Parameters μ = 40 and σ