Fig. 4.

Student exam performance. A comparison of lab attendees’ and non-attendees’ performance on a questions related to lab content, b questions not related to lab content, and c all exam questions was performed. Boxes represent the 25th to 75th percentiles with lines indicating median values. Bars (whiskers) represent minimum to maximum data values. Mean rank values for each dataset appear below the respective bar plots. Data were analyzed using the Mann-Whitney test with p values associated with significant differences between groups indicated (n.s., non-significant)