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A Polygraph Test Is Sometimes Used to Detect If Someone

Question 131

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A polygraph test is sometimes used to detect if someone is lying, but it is generally not admissible in court because of its dubious accuracy. A polygraph test is given to 98 people, and the test is wrong for 24 of them. What is the empirical probability that the polygraph test is wrong for a randomly chosen person? What is the probability that it is right?

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