Fig. 6

Competence distribution for the 20 most relevant questions for each cluster. The upper plots show the competence level (“apply”, “recall”) of the 20 most relevant questions. In contrast to all other clusters, the competence distribution in cluster 0 is higher for “apply” questions. The lower plots show all questions in terms of their difficulty index (correct [%]) and discrimination index. The relevant questions are highlighted in their respective competence colors