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- In-Class Formative Assessment in an Introductory Calculus Class
- Figure 4: Item Characteristic Curves for the parameters shown in Tab. 1. The higher the difficulty bi, the further the inflection point is located to the right.The higher the discrimination ai, the steeper the curve at the inflection point. Ideal are centered inverted-S curves with steep slopes; some of the “outliers” have been labelled.
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