Calculate the observed z value using a sample mean of 25,a population average of 20,and a standard error of the mean of 8.
A)1.5
B)3.0
C)-5.0
D)0.63

Question

Quizplus · Accepted Answer

The observed z value is calculated using the formula $z = \frac{\text{sample mean} - \text{population mean}}{\text{standard error of the mean}}$. Plugging in the given values, $z = \frac{25 - 20}{8} = \frac{5}{8} = 0.625$, which rounds to 0.63.

Calculate the Observed Z Value Using a Sample Mean of 25,a