A schedule is generally administered by a trained enumerator who asks questions face to face or over the phone and records respondentsβ answers, making it suitable even for illiterate respondents and allowing clarification of doubts. In contrast, questionnaires are usually self-administered written instruments.
Option A:
This option incorrectly describes the self-administered, mailed or online tool typical of questionnaires; schedules are not usually filled by respondents on their own.
Option B:
This option is correct because it identifies the interviewer-administered nature of schedules, which is the main practical distinction from questionnaires and has implications for cost, coverage and data quality.
Option C:
Option C is wrong because both schedules and questionnaires can contain a mix of open- and closed-ended questions; the difference lies in how they are administered, not in question format.
Option D:
Option D is incorrect as well; both instruments can be printed or delivered online. Again, the key distinction is whether an interviewer is involved, not the medium of administration.
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