One concern with random digit dialing is that this process is less likely to reach people on the do-not-call list or people who only use cell phones.This could give rise to

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Random digit dialing may result in a biased sample if it misses certain groups of people, such as those on the do-not-call list or who only use cell phones. This is known as sample selection bias, where the sample that is selected is not representative of the true population.

One Concern with Random Digit Dialing Is That This Process