Kahneman Tversky presented this and more participants guessed him as librarian

Kahneman tversky presented this and more participants

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speaks quietly. Kahneman & Tversky presented this and more participants guessed him as librarian because his description matched their notion of typical librarian. However, they were ignoring base rate of farmers and librarians in U.S. populations as important source of information nWhen this experiment was conducted, there were more farmers than male librarians in U.S. so it’s more likely that Robert is a farmer according to statistics nThe base rate which is the relative proportion of different classes in the population was different as more farmers than librarians. One possibility is that participants didn’t know these base rates
nE.g. when participants were asked“In a group of 100 people, there are 70 lawyers and 30 engineers. What is the chance that we randomly pick a person who is an engineer?” lWhy does this work? Because categories are usually homogenous. This heuristic

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