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Peer reviewedHopkins, Kenneth D.; Hopkins, B. R. – Journal of Special Education, 1979
The article illustrates a method to estimate changes in the statistical power of a study which are caused by changes in the reliability of the dependent variable. (Author)
Descriptors: Research, Research Design, Research Methodology, Research Problems
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
Download full textHopkins, Kenneth D.; Anderson, Beverly – 1973
The purpose of this module is to provide the researcher and the consumers of such research with a recognition of the assumptions and appropriate use and interpretation of each of 10 multiple comparison (MC) statistical techniques. In this self-contained and self-instructional module, the user is sensitized to the serious consequences of…
Descriptors: Achievement Tests, Autoinstructional Aids, Comparative Analysis, Educational Researchers
