The person who is purposely placed in a study by the experimenter in order to manipulate the situation the participants must engage in is called a:
According to the given question, we are asked to correctly state the term for a person who is purposely placed in a study by a researcher so that he would manipulate the situation
As a result of this, a confederate is a person who is used in experiments of a psychological nature so that they can secretly engage in the research with real subjects.
Therefore, the correct answer is confederate
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