Lie detectors a federal report finds that lie detector, Basic Statistics

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Lie detectors a federal report finds that lie detector

Question: Lie detectors A federal report finds that lie detector tests given to truthful persons have probability about 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants about thefts from previous employers, using a lie detector to assess their truthfulness. Suppose that all 12 answer truthfully. Let X = the number of people who the lie detector says are being deceptive.

(a) Find and interpret μ_X.

(b) Find and interpret σ_X.

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Basic Statistics: Lie detectors a federal report finds that lie detector

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