One of the principles of creating and refining a survey instrument is
To include both closed and open ended questions |
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To include only positive questions |
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To include personal and sensitive questions |
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To include questions that match research objectives |
The answer is: To include questions that match the research objectives.
1st option is not true because of open-ended questions would be interpreted differently by differently. Hence we cannot get any objective or rigid answer and these type of responses are not useful for statistical analysis.
For the 2nd option, if we only include positive questions the survey instrument will be extremely biased. This is not desirable.
For the 3rd option, if we include personal and sensitive question it is very likely that the question would be unanswered.
The last option is only making sense. So it is the correct option.
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