Introduction to Correlation


Suppose a student wants to know whether a relationship exists between the number of hours he/she spends working on homework and their final grade.





Suppose a store owner wants to know whether a relationship exists between the amount of money spent in advertising and the store's income.




Or suppose a police officer wants to know whether a relationship exists between crime and graduation rates in an area. 


How would each of these people determine if a relationship exists?

In this lesson, you learn how to describe what type of relationship, or correlation, exists between two quantitative variables.