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| Hopkins, Kenneth D. | 1 |
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Peer reviewedHopkins, Kenneth D.; Gullickson, Arlen R. – Journal of Experimental Education, 1992
A metanalysis involving 62 studies compared the response rate to mailed surveys with and without a monetary gratuity. The average response rate increased 19% when a gratuity was enclosed. Other findings that substantiate that the external validity of surveys can be increased by gratuities are discussed. (SLD)
Descriptors: Mail Surveys, Meta Analysis, Questionnaires, Research Design
