In order to prove that variables are causally related,that is that no one causes the other,it is necessary to determine that no other variable is in fact the causal agent.

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In order to establish causality between two variables, we need to eliminate the possibility of any other variable being the causal agent. This can be done through controlled experiments, statistical analysis, and other methods. If we cannot rule out the influence of other variables, then we cannot say for certain that one variable causes the other.

In Order to Prove That Variables Are Causally Related,that Is