In an experiment by Tversky and Kahneman (1973), subjects were given a description of a young man, Steve, who closely resembles a typical librarian, and were told that the description was drawn from a pool of 100 men, 10 of whom were librarians. Subjects assumed that Steve is a librarian. This is an example of:

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The representativeness heuristic is when people judge the probability of an event by how much it resembles what they consider to be a typical example of that event, as in assuming Steve is a librarian because he fits the stereotype.

In an Experiment by Tversky and Kahneman (1973), Subjects Were