Suppose you see Mary do very poorly on a classroom test. From this you conclude that Mary is not only stupid, but also has few friends, a poor personality, a difficult family life, and a hard time in everything she does. You have committed an error called:

Question

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The error described is the halo effect, which is when a person forms an overall impression of someone based on a single trait or characteristic. In this case, Mary's poor performance on the test has led the observer to assume that she is incompetent in all areas of her life.

Suppose You See Mary Do Very Poorly on a Classroom