Which of the following is a disadvantage of the mailed questionnaire method for primary data collection?
A. Limited geographical coverage
B. Low response rate and potential non-response bias
C. High cost per respondent
D. Requires highly trained enumerators
Answer: Option B
Solution (By JKExamLibrary)
Mailed questionnaires often suffer from low return rates, and respondents who reply may differ systematically from non-respondents, introducing bias that is difficult to assess or correct.
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