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. This research was conducted in partial fulfillment of the requirements for the MA degree in psychology at the Ohio State University. The author is indebted to Edwin Barker for his advice and help in conducting the research, and to Harold McCurdy, Grant Dahlstrom and William Eichman for their help in preparing the manuscript.
. Requests for reprints should be sent to James C. Carpenter, Department of Psychology, University of North Carolina, Chapel Hill, North Carolina 27514.