PERC 2015 Abstract Detail Page
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| Abstract Title: | Characteristics Of Pairs Of Questions That Students Answer Similarly |
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| Abstract: | We discover pairs of questions (items) that students answer in a dependent manner by applying Fisher's Exact Test to a sample of 1080 students answering 257 items in the MOOC 8MReVx. To eliminate false positives arising from the large range of student abilities, we divided students into groups of similar ability by: 1) similar percentage correct on first try (CFT) of all available problems, 2) similar percentage CFT of problems attempted, and 3) similar skills determined by Item Response Theory. All three methods dramatically reduce the number of false dependencies in a similar fashion. Importantly, using 5 groups 70% (vs. 5% without groups) of dependent pairs of items have identical ratings in all four categories of the Taxonomy of Introductory Physics Problems, 70% (vs. 23%) are of the same pedagogical type, 45% (vs. <1%) are items in the same problem, and 100% (vs. 12%) reside in the same course Chapter. |
| Abstract Type: | Contributed Poster Presentation |
Author/Organizer Information | |
| Primary Contact: |
Trevor A Balint George Washington University Department of Physics 725 21st St. Washington, DC 20052 Phone: 202-994-6275 |
| Co-Author(s) and Co-Presenter(s) |
Raluca Teodorescu, George Washington University Department of Physics Kimberly Colvin, University at Albany SUNY Department of Educational and Counseling Psychology Youn-Jeng Choi, Massachusetts Institute of Technology Department of Physics David E. Pritchard, Massachusetts Institute of Technology Department of Physics |
