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CA Foundation · Quantitative Aptitude · Statistical Description of Data

Which of the following is a limitation of collecting primary data through mailed questionnaires compared with personal interviews?

A key limitation of mailed questionnaires is a high rate of non-response, since many recipients never return the form. They are cheap and cover scattered populations well, but they cannot offer on-the-spot clarification the way personal interviews can.

  1. AThe cost per respondent is usually higher
  2. BThe investigator can probe and clarify answers on the spot
  3. CThe rate of non-response is generally highCorrect
  4. DCoverage of a widely scattered population is not possible

Explanation

Mailed questionnaires are cheap and reach scattered respondents, but many people do not return them, so non-response is high. Probing and clarification are strengths of personal interviews, not of mailed questionnaires. Hence options A, B and D describe the opposite of reality.

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