The principle for what questions should be used in a questionnaire is “relevance,” which means:
A.
Every question in the questionnaire should help you answer the research questions of your study.
B.
Irrelevant questions should be left out.
C.
Questions about name, gender, age, and marital status should not be included unless you do need the information for analysis.
D.
You should know exactly what specific information you need to collect.