Which of the following is a disadvantage of the mailed questionnaire method for primary data collection?
A. Low response rate and potential non-response bias
B. Requires highly trained enumerators
C. High cost per respondent
D. Limited geographical coverage
Answer: Option A
Solution (By JKSSB Mock Tests)
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.
Explanation:
Life expectancy is derived from life tables constructed using age-specific death rates, which rely on vital statistics data on deaths and population by age.
No comments yet. Be the first to start the discussion!