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

To find the z-score, we use the formula:

z = (X - µ) / σ

where X is the value we want to calculate the z-score for, µ is the population mean, and σ is the population standard deviation.

In this case, we have:

X = 60
µ = 80
σ = 20

Plugging these values into the formula gives:

z = (60 - 80) / 20 = -1

Therefore, the z-score for students studying 60 minutes per week is -1. Option B is the correct answer.

A Researcher Determines That Students Study an Average of 80