29.07.2022 - 08:53

Refer to the sample data for polygraph tests shown below. If one of the test subjects is randomly selected, what is the probability that the subject is not lying? Is the result close to the probability of 0.463 for a negative test result?

Question:

Refer to the sample data for polygraph tests shown below. If one of the test subjects is randomly selected, what is the probability that the subject is not lying? Is the result close to the probability of 0.463 for a negative test result?

No (Did Not Lie) Yes (Lied)
Positive test results 1414 3737
Negative test results 3333 1111
Answers (1)
  • Geraldine
    April 11, 2023 в 00:33
    The probability that the subject is not lying can be found by adding up the number of subjects who did not lie and received a negative test result, which is 1414, and dividing it by the total number of test subjects, which is 1414 + 3737 + 3333 + 1111 = 9595. Therefore, the probability is: 1414/9595 = 0.147 This is not close to the probability of 0.463 for a negative test result. It indicates that a negative test result is more likely to occur due to a subject not lying, rather than the test being inaccurate or unreliable.
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