Table 3

Results, student group 200

Participant (even numbers = girls, uneven = boys: age, years)Pre-test score (max = 7)Pre-estimated
Difficulty (max = 4)
Post-test score (max = 7)Post-estimated
Difficulty (max = 4)
Estimated level of joy (max = 4)
201:1240300
202:1320404
205:1220400
207:1570704
Total15(54%)0(0%)17(61%)0(0%)8(50%)

Note(s): Group 200 had a total of 15 correct answers in the pre-test (mean = 3.8. After the lesson, participating students got a total of 17 correct answers (mean = 4.3). The standard deviation was 2.4 in the pre-test and 1.9 in the post-test. Cohen's d = 0.231 (trivial effect size). Cohen's d was calculated using the formula: d = (M1 – M2) / SDpooled. The knowledge test indicated an improvement of 7% units

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