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Surveys are effective for gathering information on various topics, with four main types: telephone surveys, mail surveys, face-to-face surveys, and online surveys. Telephone surveys can achieve random sampling from large populations since most people have phone access; however, they can be costly, and many individuals use caller ID to screen calls. Mail surveys are valuable as they reach people at their permanent addresses, utilizing databases from the US postal service to randomly sample specific locations. They also allow respondents to complete surveys privately. Each type of survey has its advantages and drawbacks, making them suitable for different research needs.
