Fig. 2

Wright map indicating item and person measures on logit scale. Person (student) measures are on the left. Each “#” represents 3 persons. Each “.” represents 1 person. Each person is represented twice on the map, once for their pre-test submission and once for their post-test submission. Each item is placed on the right (For example item 1 is labeled as Q1). Persons higher up on the scale are inferred to have higher ability. Items higher on the scale are inferred to be more difficult. The Rasch model predicts that a student should answer items correctly that are at the same logit scale value and below them. Wright maps of pre- and post-test results from both activity groups are shown in Appendix 4. A comparison table of item difficulties in pre- versus post-tests is given in Appendix 5