High interviewer bias is a primary disadvantage of using mail interviews to collect research data.

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Mail interviews, also known as postal surveys, are a form of self-administered surveys where respondents complete a questionnaire and return it by mail. Unlike face-to-face or telephone interviews, the researcher does not have the opportunity to clarify or probe responses, which limits their ability to control the quality and accuracy of the data. While there is potential for social desirability bias or response bias, the risk of interviewer bias is lower.

High Interviewer Bias Is a Primary Disadvantage of Using Mail