Correlation is the relationship between two factors.
Two Types:
Positive- As one variable increases, the other variable increases. This is a proportional relationship.
Advantages:
Can establish a relationship between two variables
Researchers can statistically analyze situations that could not be manipulated experimentally for ethical or practical reasons
Disadvantages:
Cannot establish CAUSE AND EFFECT
Third variable may not be established
Only linear relationships can be classified as correlation. Curvilinear is not correlation!!
e.g. The relationship between temperature and aggression is curvilinear; the relationship between aggression and temperature is linear up to a point, but at higher temperatures aggression begins to decrease.
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