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ID How do you think caller ID has affected phone surveys?
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Caller ID is a phone service feature that allows the receiver to see the caller's number before answering. This feature has been instrumental in helping individuals identify who is calling them, thereby giving them the choice to answer or ignore the call. Show more…
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How do you think caller ID has affected phone surveys?
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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