The tendency of students in working groups to exert more effort on their project when their teacher is standing within earshot is an example of

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The Hawthorne effect is the tendency of individuals to perform better when they know they are being observed. This phenomenon was first observed in a series of experiments conducted at the Hawthorne Works factory in the 1920s and 1930s. In the context of the given example, students are likely to work harder when they know their teacher is within earshot because they want to impress the teacher and avoid being seen as lazy or unproductive.

The Tendency of Students in Working Groups to Exert More