Stanley examines the impact of group size on conformity behavior in an experiment. He makes groups of two, five, or ten people stand on a city street and stare up at a window. He then records the number of passersby who stop and stare at the window. This study is an example of a(n)

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Stanley's study manipulates one factor, the size of the group (with three levels: two, five, or ten people), to observe its effect on a dependent variable, the number of passersby who stop and stare. This setup defines an experiment with one independent variable.

Stanley Examines the Impact of Group Size on Conformity Behavior