Random-digit dialing. Random-digit dialing is often used to select telephone survey samples. This technique randomly selects the

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Random-digit dialing. Random-digit dialing is often used to select telephone survey samples. This technique randomly selects the last four digits of a telephone number from a telephone exchange. (An exchange is the first three telephone numbers after the area code.)

This type of sample gets around the problem of using a telephone book as a sampling frame; however, other types of problems may still be encountered. What types of selection biases may ensue from this method?

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