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|+* Interaction Effect: Occurs when two or more independent variables combine to produce an effect over and above their main effects|
|+* P = Person; Subject Variable|
|+ * This is essentially a correlational analysis, and thus we cannot determine causation with correlation|
|+* E = Environment; Manipulated Variable|
|+* When you get a main effect of "E", researchers like this because it suggests the power of the environment is strong enough to produce the same behavior in different groups of people.|
|+* Interactions in PxE are more interesting|