What technique does random digit dialing utilize?

Random digit dialing utilizes telephone numbers generated randomly by a computer. This technique is designed to gather a representative sample of the population without requiring a predefined list of phone numbers. By creating phone numbers at random, it allows researchers to contact a wide and diverse range of respondents, including those who have unlisted or new phone numbers. The method is particularly effective for telephone surveys because it minimizes selection bias and increases the likelihood of reaching people from various demographics.

This makes it a valuable tool in public opinion polling and survey research where comprehensive representation of the population is crucial. The randomness of the digits ensures that all segments of the population have a chance to be included, contributing to the validity of the research results.