Question: In order to increase the response rate to mail questionnaires
In order to increase the response rate to mail questionnaires, researchers sometimes include a dollar bill or other monetary incentive to reward the respondent for his or her cooperation. Could there be occasions where a relatively large reward—e.g., the inclusion of a $20 bill with a short questionnaire—might end up exerting a biasing influence on the answers the respondent provides? If so, give a real or hypothetical example of such an occasion.
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