Answered: Polygraphs Lie detectors are…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Polygraphs Lie detectors are controversial instruments,

barred from use as evidence in many courts. Nonethe-
less, many employers use lie detector screening as part

of their hiring process in the hope that they can avoid
hiring people who might be dishonest. There has been
some research, but no agreement, about the reliability of
polygraph tests. Based on this research, suppose that a

polygraph can detect 65% of lies, but incorrectly identi-
fies 15% of true statements as lies.

A certain company believes that 95% of its job applicants

are trustworthy. The company gives everyone a poly-
graph test, asking, “Have you ever stolen anything from

your place of work?” Naturally, all the applicants answer
“No,” but the polygraph identifies some of those answers
as lies, making the person ineligible for a job. What’s the
probability that a job applicant rejected under suspicion
of dishonesty was actually trustworthy?

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