A researcher determines that students study an average of 80 20 (M SD)minutes per week.Assuming these data are normally distributed,what is the z score for students studying 60 minutes per week?
A)1.0
B)-1.0
C).3413
D).1587

Question

A researcher determines that students study an average of 80  20 (M  SD)minutes per week.Assuming these data are normally distributed,what is the z score for students studying 60 minutes per week?
A)1.0 
B)-1.0 
C).3413 
D).1587

Quizplus · Accepted Answer

We can use the formula for calculating z-score: 
z = (x - μ) / σ
where x is the value we want to find the z-score for (60 in this case), μ is the mean (80), and σ is the standard deviation (20). 
Plugging in the values, we get: 
z = (60 - 80) / 20
z = -1
Therefore, the z-score for students studying 60 minutes per week is -1. Option B is the closest choice.

A Researcher Determines That Students Study an Average of 80