# Question: Consider a lie detector called the Computerized Voice Stress Analyzer

Consider a lie detector called the Computerized Voice Stress Analyzer (CVSA). The manufacturer claims that the CVSA is 98% accurate and, unlike a polygraph machine, will not be thrown off by drugs and medical factors. However, laboratory studies by the U.S. Defense Department found that the CVSA had an accuracy rate of 49.8%, slightly less than pure chance. Suppose the CVSA is used to test the veracity of four suspects. Assume that the suspects' responses are independent.

a. If the manufacturer's claim is true, what is the probability that the CVSA will correctly determine the veracity of all four suspects?

b. If the manufacturer's claim is true, what is the probability that the CVSA will yield an incorrect result for at least one of the four suspects?

c. Suppose that in a laboratory experiment conducted by the U.S. Defense Department on four suspects, the CVSA yielded incorrect results for two of the suspects.

Make an inference about the true accuracy rate of the new lie detector.

a. If the manufacturer's claim is true, what is the probability that the CVSA will correctly determine the veracity of all four suspects?

b. If the manufacturer's claim is true, what is the probability that the CVSA will yield an incorrect result for at least one of the four suspects?

c. Suppose that in a laboratory experiment conducted by the U.S. Defense Department on four suspects, the CVSA yielded incorrect results for two of the suspects.

Make an inference about the true accuracy rate of the new lie detector.

## Answer to relevant Questions

The Republican governor of a state with no income tax is appointing a committee of five members to consider changes in the income tax law. There are 15 state representatives-seven Democrats and eight Republicans-available ...Children who develop unexpected difficulties with the spoken language are often diagnosed as specifically language impaired (SLI). A study published in the Journal of Speech, Language, and Hearing Research (Dec. 1997) ...An emergency rescue vehicle is used an average of 1.3 times daily. Use the Poisson distribution to find a. The probability that the vehicle will be used exactly twice tomorrow b. The probability that the vehicle will be ...A “one-shot” device can be used only once; after use, the device (e.g., a nuclear weapon, space shuttle, automobile air bag) either is destroyed or must be rebuilt. The destructive nature of a one-shot device makes ...Entomologists are continually searching for new biological agents to control the water hyacinth, one of the world’s worst aquatic weeds. An insect that naturally feeds on the water hyacinth is the delphacid. Female ...Post your question