The table below displays results from experiments with polygraph instruments. Fi

Question

The table below displays results from experiments with polygraph instruments. Find P(subject lied I negative test result). Compare this result with the probability of selecting a subject with a negative test result, given that the subject lied. Are P(subject lied I negative test result) and P(negative test result I subject lied) equal? Did the Subject Actually Lie? No (Did Not Lie) Yes (Lied) Positive test results Negative test results 19 30 P(subject lied negative test result) = (Round to three decimal places as needed )

Explanation / Answer

Solution:-

P(Subject lied|negative test result) = 9/(30+9)
= 9/39
= 0.23076

= 0.231(rounded)

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