The sample mean is 12,the population average is 19,and the standard error of the mean is 4.What is the observed z value?
A)-1.75
B)-0.75
C)1.75
D)3.5,

Question

Quizplus · Accepted Answer

We can use the formula:

z = (sample mean - population mean) / standard error

Inserting the values given, we get:

z = (12 - 19) / 4
z = -7/4
z = -1.75

Therefore, the observed z value is -1.75, which corresponds to choice A.

The Sample Mean Is 12,the Population Average Is 19,and the Standard