Question

Polygraph lie-detector machines are commonly used in criminal investigations. The device measures nervous excitement, operating on the idea that if a person is telling the truth they will remain calm. The American Polygraph Association claims that polygraphs accurately identify liars 90% of the time. In other words, if a person lied the test results will be positive 90% of the time. Although the polygraph test is good at identifying liars, there is a 50% chance that the polygraph test will say a truthful person is lying. A police force wants to predict the accuracy of lie-detector tests for 1,000 suspected criminals. Assume that 700 per 1,000 suspected criminals tell the truth during polygraph tests. Lie Truth Row Totals Test result: negative Test result: postive Column Totals Q 1,000 Barber, N. (2013). Do Lie Detectors Work? Psychology Today What is the value of Q? 300

Answer 1

ANSWER::

	Lie	Truth	Total
Negative	270	110	380
Positive	270	350	620
Total	540	460	1000

Q = 350

OPTION:: 2 IS CORRECT (350)

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