Practice Problem ANSWERS: Regression

Item 1

Calculate the z-score, assuming:

X = 10
mean = 50
stdev = 10
X – mean = – 40 
z score = - 4.0

 

Item 2

Calculate the z-score, assuming:

X = 80
mean = 50
stdev = 15
X – mean = 30
z score = 2.0 

 

 

Item 3

Calculate the z-score, assuming:

X = 112
mean = 100
stdev = 15
X – mean = 12
z score = .80

 

 

Item 4

Calculate the raw score, assuming:

z = 1.5
mean = 115
stdev = 10
z * stdev = 15
X = 130

 

 

Item 5

Calculate the raw score, assuming:

z = -1.37
mean = 100
stdev = 20
z * stdev = 27.4
X = 72.6

 

 

Item 6

Calculate the raw score, assuming:

z =  2.54
mean = 80
stdev = 20
X = 130.8 
   2.54*20 = 50.8 
   50.8 + 80 = 130.8

 

 

NOW YOU CHOOSE:

Read A Bit More About Regression
Read Even More About Regression
Listen to Lecture 5 (coming soon)
Practice Problems
More Practice Problems
Review Basic Facts About Regression
Review Day 6 Vocabulary
Review Day 6 Formulas
Take Quiz 6
Summary