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

Question

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Random digit dialing may not be truly random if certain segments of the population are systematically excluded, leading to sample selection bias. In this case, people on the do-not-call list or those who only use cell phones may be underrepresented in the sample, leading to potentially biased results.

One Concern with Random Digit Dialing Is That This Process