ID How do you think caller ID has affected phone surveys?
Added by Erin A.
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Caller ID allows people to see who is calling them before they answer the phone. Show more…
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Key Concepts
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Software to detect fraud in consumer phone cards tracks the number of metropolitan areas where calls originate each day. It is found that $1 \%$ of the legitimate users originate calls from two or more metropolitan areas in a single day. However, $30 \%$ of fraudulent users originate calls from two or more metropolitan areas in a single day. The proportion of fraudulent users is $0.01 \%$. If the same user originates calls from two or more metropolitan areas in a single day, what is the probability that the user is fraudulent?
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