Some Employers Use Lie Detector Tests to Screen Job Applicants

question 196

Multiple Choice

Some employers use lie detector tests to screen job applicants. Lie detector tests are not completely reliable. Suppose that in a lie detector test, 65% of lies are identified as lies and that 14% of true statements are also
Identified as lies. A company gives its job applicants a polygraph test, asking "Did you tell the truth on your job
Application?" Suppose that 93% of the job applicants tell the truth during the polygraph test. What is the
Probability that a person who fails the test was actually telling the truth?

• A) 0.741
• B) 0.259
• C) 0.349
• D) 0.14

---

Definitions:

Y-Intercept

The y-intercept is the point where a graph intersects the y-axis, typically represented as the value of y when x equals 0.

Noncollinear Points

A set of three or more points that do not all lie on a single straight line.

Coefficient Matrix

A matrix consisting of the coefficients of the variables in a set of linear equations.

Linear Equations

Equations of the first degree, where variables are raised only to the power of one and graph as straight lines.