Strength of linear Relationship
r value 
Interpretation 
0 
No correlation 
+1 
Perfect positive linear relationship 
1 
Perfect negative linear relationship 
Example
Student 
Hours studied 
% Grade 
A 
6 
82 
B 
2 
63 
C 
1 
57 
D 
5 
88 
E 
3 
68 
F 
2 
75 
 Independent variable in this example is the number of hours studied.
 The grade the student receives is a dependent variable.
 The grade student receives depend upon the number of hours he or she will study.
 Are these two variables related?
