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Abstract Title: Test-Retest Reliability of the Force Concept Inventory (FCI)
Abstract: The FCI has influenced the development and acceptance of many research-based pedagogies. Although the FCI's external validity was studied, no data exists on test-retest reliability. We administered the FCI to students enrolled in an Electricity&Magnetism course in the first week of the semester and re-administered the FCI that same week. No mechanics review took place between test administrations. A total of 100 students completed the test and re-test. We find a correlation of r=0.89 between test and re-test total scores, suggesting strong reliability. We then looked at changes between Right and answers and Wrong answers in the test and re-test. We isolate five possible transitions: Right-Right, Right-Wrong, Wrong-Right, Wrong-Wrong_same, Wrong-Wrong_different. Students changed their choices on 31% of items, suggesting weak reliability. Chi-square analyses show the test to be neither completely random nor completely consistent. Using an iteratively constructed probabilistic model, we report the probability for each transition.
Abstract Type: Contributed Poster

Author/Organizer Information

Primary Contact: Nathaniel Lasry
John Abbott College
and Co-Presenter(s)
Kelly Miller, McGill University
Orad Reshef, McGill University
Ariel Dahan, McGill University
Helena Dedic, Vanier College
Steve Rosenfield, Vanier College