Does a confounding Variable always have an effect on the dependant variable? My textbook says that the confounding variable has an unwanted effect on the dependant variable, however i was under the impression that the problems with confounding variables was that they make you UNSURE of what caused the change in the Dependant variable, as i thought the problem was you could not PROVE it. I am unsure because if they have an unwanted effect, how can you also be confused, that would make the experiment not questionable but totally pointless. I am wondering if they always have an effect, or make things unclear?
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