psychology 

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KembaraXtra-Psychology – Base-Rate Fallacy

The base-rate fallacy is a systematic error in probabilistic reasoning in which individuals ignore or underweight base-rate information when making judgments about likelihood. Instead of incorporating prior probabilities, people often rely on representativeness, vivid details, or stereotypes. Classic experiments demonstrated that when participants are given descriptive personality sketches and asked to infer group membership, they frequently disregard statistical information about group proportions. This fallacy reveals the limits of intuitive reasoning and highlights the importance of Bayesian principles in accurate judgment.


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