Correlations

Correlational method

• Correlation expresses a relationship between two variables.

• Does not prove causation.

• Have to do an experiment to find cause and effect

• Often there is a 3rd factor that is a cause

What are the types of correlations?

Positive Correlation:

The variable go in the same direction

Negatve Correlation or inverse relationship:

The variables go in different directions

Correlation Coefficient

• A number that measures the strenght of a relationship.

  • Range is from -1 to +1

  • The relationship gets weaker the closer you get to zero.

Scatter Plot Graph