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

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) 1.5B) 3.0C) -5.0D) 0.63

Grant Wotalewicz · Accepted Answer

Final Answer : D, Explanation :   The observed z value is calculated using the formula   z = sample mean − population mean standard error of the mean z = \frac{	ext{sample mean} - 	ext{population mean}}{	ext{standard error of the mean}} z = standard error of the mean sample mean − population mean ​  . Plugging in the given values,   z = 25 − 20 8 = 5 8 = 0.625 z = \frac{25 - 20}{8} = \frac{5}{8} = 0.625 z = 8 25 − 20 ​ = 8 5 ​ = 0.625  , which rounds to 0.63.

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

Definitions

Learning Objectives

Learning Objectives

Related questions