Research Abstracts Online
January 2009 - March 2010
University of Minnesota Twin Cities
College of Education and Human Development
Department of Educational Psychology
PI: Ernest C. Davenport, Jr.
The Effects of Ability Level of the Examinees in Answer Copy Pairs on the Power and Type I Error Rate of GBT Index to Detect Answer Copying on Multiple-choice Tests
The GBT index developed by Van der Linden and Sotaridona (2006) is the latest statistical method suggested to detect answer copying on multiple-choice tests and grounds on a strong statistical basis. However, there hasn’t been research which has explored the empirical type I error rate and power of the GBT index. Three variables will be hypothesized to have an effect on the statistical properties of the GBT index. These variables are the ability level of the source examinee (12 levels), the ability level of the cheater examinee (12 levels), and the amount of copying (10 levels). The effects of these variables will be explored in a simulation environment by manipulating these variables and calculating the empirical power and type I error rate of the GBT index under different conditions. The results of the study will reveal information about the statistical properties of the GBT index under different conditions for the people who may want to use this method in practice to detect answer copying or to provide additional evidence of answer copying.
Cengiz Zopluoglu, Graduate Student