Results from Experiments with Polygraph Instruments Did the Subject Actually Lie? No Yes (Did Not Lie) (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) If one of the subjects is randomly selected, find the probability that the subject had a true negative test result. go Next page 4 O