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Originally Posted by Amano
ok, since we have that question answered...
then how DO you prove a causational effect between two variables?
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You can't. But you can make a very very educated guess by doing an experiment with a control group. In other words, you try to get two nearly identical groups and administer the independent variable (which will mean the IV will be the only difference between the two groups) and see if the variable makes an effect. Quasi Experiments will work too, but we won't go into that...