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Correlation
A mathematical technique in which a researcher investigates an association between 2 co-variables. Plotted on a scattergram where each axis represents one of the investigated variables.
Correlation coefficient
A number between -1 and +1 that represents the direction and strength of the relationship between co-variables
Correlation coefficient of +1
Perfect positive correlation
Correlation coefficient of -1
Perfect negative correlation.
As coefficient goes closer to +1 or -1
Relationship is stronger
As coefficient goes closer to 0
Relationship is weaker.
+0.50 and -0.50
Relationship is exactly the same strength.