Fig. 5

Item analysis of exam scores provides no evidence for an effect of CBL on summative assessment performance. a Cumulative exam scores corrected for guessing of students taking CBL-based CAFA 3 – Chromatin (red symbols) or CBL-based CAFA 4 – Replication (blue symbols). Control questions are 88 exam questions not specifically related to the topics chromatin and replication, whereas the 5 chromatin- and 6 replication-related questions were designed to specifically interrogate these respective topics. b p’-values for control questions, chromatin-related questions and replication-related questions. c Item-rest correlations of the three question sets. In all panels the horizontal black bars indicate median values, boxes indicate the interquartile range (IQR), and whiskers indicate 1.5 × IQR