The IRCs for all 30 questions on the FCI using the approach of Morris et al. (Ref. 2). This figure is analogous to Fig. 4 in Wang and Bao (Ref. 4). Each graph shows the percentage of respondents (vertical axis) at each ability level (horizontal axis) on a given item selecting a given answer choice: + = 1; ⋆ = 2; ⋄ = 3; △ = 4; □= 5.
A comparison of the percent correct (this work, vertical axis) with the difficulty parameter (“b,” horizontal axis) from Wang and Bao (Ref. 4).
IRCs for a “dichotomously” scored Question 13 from the FCI.
The percentage of students who responded correctly to each question on the FCI.
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