Perhaps the most widely used form of survey research is

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The telephone interview is the most widely used form of survey research because it is cost-effective, efficient, and allows researchers to quickly reach a large and diverse population. It also allows for probing and clarification of responses. Face-to-face personal interviews can be expensive and time-consuming, mail questionnaires have lower response rates, and fax questionnaires are less commonly used.

Perhaps the Most Widely Used Form of Survey Research Is