What is the purpose of the “what do you think was the purpose of this study” question on the end of experiments?
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In many scientific surveys you don‘t want that the people doing the surveys knowing the exact purpose on what is being tested. If they do know, they will probably give biased answers which will often prevent to make a conclusion regarding a broader part of the population you‘re aiming for. So it basically is the experimenter asking „do you know to much?“ and if so they can sort you out if your given answers already seem biased.
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