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

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Definitions:

VPN

Virtual Private Network; a service that encrypts your internet connection and hides your online identity.

Public-Key Encryption

A cryptographic system that uses pairs of keys: public keys which may be disseminated widely, and private keys which are known only to the owner.

Private Key

A secret key used in encryption algorithms, kept confidential by the owner, for securing digital communications or transactions.

Public Key

A public key is part of a cryptographic key pair used in public-key cryptography that is made available publicly for encrypting messages or verifying signatures, while the corresponding private key remains secret.