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The "don't know" or "no opinion" response should always be available to respondents.
Q3: The "don't know" or "no opinion" response
Q7: If a response does not fit any
Q15: Contractors should be alert to hazardous substances
Q38: Researcher's actions always involves measurement of some
Q63: The primary objective of longitudinal research is
Q111: The statistical methods of establishing sample size
Q112: Semantic differential scales yield interval data.
Q125: It is generally agreed that itemized rating
Q125: The experimental design symbol used to describe
Q127: The relatively structured approach of focus groups