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Let event Aequals=subject is telling the truth and event Bequals=polygraph test

ID: 3204201 • Letter: L

Question

Let event Aequals=subject is telling the truth and event Bequals=polygraph test indicates that the subject is lying. Use your own words to translate the notation Upper P left parenthesis B|A right parenthesisP(B|A) into a verbal statement. Choose the correct option below. A. The probability that the polygraph indicates lying given that the subject is actually lying. B. The probability that the polygraph indicates truthfulness given that the subject is actually telling the truth. C. The probability that the polygraph indicates lying given that the subject is actually telling the truth. D. The probability that the polygraph indicates truthfulness given that the subject is actually lying.

Explanation / Answer

P(B|A) means probability of B given that event A has occured

We know that here A=subject is telling the truth and B=polygraph test indicates that the subject is lying

So this means polygraph test indicates that the subject is lying given that subject is telling the truth

Hence the answer is C The probability that the polygraph indicates lying given that the subject is actually telling the truth

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