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Support theory is a descriptive model of probability judgment that posits that judgments of probability are made based on descriptions of events rather than on events themselves.

Probability theory provides a normative framework for determining the probability of a combination of disjoint events. If two events A and B are exclusive, and have probabilities p(A) and p(B) of occurrence, the probability of one or the other occurring is exactly p(A) + p(B) = p(A or B). “A or B” is referred to as the disjunction of A and B. For example, if A is “The patient's heart rate is between 60 and 70 beats per minute” and B is “The patient's heart rate is between 70 and 80 beats per minute,” the disjunction might be expressed ...

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