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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > October  >
In the Classroom
Cheating Probabilities on Multiple Choice Tests
Gaspard T. Rizzuto and Fred Walters
University of Southwestern Louisiana, Department of Chemistry, PO Box 44370, Layfayette, LA 70504-4370
Cover
October 1997
Vol. 74 No. 10
p. 1185
Abstract
This paper is strictly based on mathematical statistics and as such does not depend on prior performance and assumes the probability of each choice to be identical. In a real life situation, the probability of two students having identical responses becomes larger the better the students are. However the mathematical model is developed for all responses, both correct and incorrect, and provides a baseline for evaluation. David Harpp and coworkers (2, 3) at McGill University have evaluated ratios of exact errors in common (EEIC) to errors in common (EIC) and differences (D). In pairings where the ratio EEIC/EIC was greater than 0.75, the pair had unusually high odds against their answer pattern being random. Detection of copying of the EEIC/D ratios at values >1.0 indicate that pairs of these students were seated adjacent to one another and copied from one another. The original papers should be examined for details.

See Letter re: this article.
More Information
*  Citation
 Rissuto, Gaspard T.; Walters, Fred. J. Chem. Educ. 1997 74 1185.
*  Keywords
 Teaching/Learning Aids, Teaching/Learning Theory/Practice, and Chemical Education Research
*  History
 Created:
Last Updated:		 July 27, 1999
June 23, 2005
Link to Letter added (May 2004).
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