If your sample mean is 12, your population average is 19, and your standard error of the mean is 4, what is your observed z value?
A)−1.75
B)5
C)4
D)6

Question

Quizplus · Accepted Answer

The formula for the z-score is:

z = (x - μ) / SE

where:

x = sample mean = 12
μ = population average = 19
SE = standard error of the mean = 4

Plugging in the values, we get:

z = (12 - 19) / 4
z = -1.75

Therefore, the observed z value is -1.75. The answer is A.

If Your Sample Mean Is 12, Your Population Average Is