Fig. 5

Difficulty index of each question highlighting the 20 most relevant questions per cluster. The questions are ordered by their position in the test with the 20 most relevant questions per cluster highlighted. Each cluster is represented by two graphs. In the upper graph, the relevant questions are colored according to their competence level (“apply” = purple, “recall” = green) and plotted against the difficulty index (correct [%]). In the lower graph blue indicates correctly answered questions and red indicates incorrectly answered questions plotted against the confidence scores. The larger the dots, the more students answered the same way