A local survey asks residents to report whether a recent media campaign changed their daily driving behavior. This is an example of which type of survey?

• A. Revealed preference
• B. Experimental survey
• C. Perceived impact survey
• D. Stated preference

Answer: (D)

This question hinges on the difference between what people say they did or would do versus what actually happened. The survey asks residents to report whether the media campaign changed their daily driving behavior, which means the data come from their own statements about behavior change. That is a stated preference—the respondent is expressing what they would or did do in response to the campaign rather than providing objective, observed behavior data.

It’s not measuring actual behavior from records (which would be revealed preference), and there’s no experimental design with an intervention being tested (which would be an experimental survey). It’s also not simply assessing perceived impact in general, since the focus is on their own self-reported change in behavior, i.e., a stated behavior change.