In a park,a guy you do not know sits near you.His mere presence affects your behavior even though he is doing nothing.In the context of social facilitation,this person is best described as a(n):

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This person is best described as a co-actor in the context of social facilitation. Even though he is not actively engaging with you, his presence is affecting your behavior, which is a characteristic of social facilitation. A confederate is someone who is part of an experiment and is aware of the true purpose of the study, whereas an ingroup member and comrade are terms used to describe people who are part of a social group that you belong to.

In a Park,a Guy You Do Not Know Sits near You.His