Refer to Table 4-1 and assume that 1 of the 98 test subjects is randomly selected. Find
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Refer to Table 4-1 and assume that 1 of the 98 test subjects is randomly selected. Find the probability of selecting a subject with a negative test result, given that the subject lied. What does this result suggest about the polygraph test?
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Table 4-1 Results from Experiments with Polygraph Instruments Did the Subject Actually Lie? No (Did Not Lie) Yes (Lied) Positive test result 15 42 (Polygraph test indicated that the subject lied.) (false positive) (true positive) Negative test result 32 9 (Polygraph test indicated that the subject did not lie.) (true negative) (false negative)
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