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1 Covariation: Changes in the assumed cause (X) are related to changes in the assumed effect (Y). Changing X results in a predictable change in Y.  Temporal Precedence: The assumed cause must occur before the asssumed effect.
Nothing was controlled by the researchers. It is important to not that correlational research is not causal research. In other words, we can not make statements concerning cause and effect on the basis of this type of research. There are two major reasons why we can not make cause and effect statements. First, we donÂ¹t know the direction of the cause. Second, a third variable may be involved of which we are not aware.