Question

Polygraph tests have an accuracy rate of about 90% meaning a positive will indicate the person is lying. A company of 5000 employees has everyone submit to a polygraph test. It turns out there are 50 employees who will lie during their polygraph. (Do not use commas.)

	Positive test result	Negative test result	Total
You are lying			50
You were not lying
Total			5000

Answer 1

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Answer:

From the given data, we have 90% of 4950 = 4455 correctly identifying truth tellers

we have 90% of 50  = 45 correctly identifying truth tellers. Rest are negative -> 5

		test result
		Positive	Negative test result	total
in actual	You are lying	45	5	50
	You were not lying	4455	495	4950
	total	4500	500	5000