Table 2

Results, student group 100

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)
101:1570704
102:1203440
103:1371714
104:1470704
105:1222704
106:1232723
Total26(62%)8(40%)39(93%)7(35%)19(63%)

Note(s): Group 100 had a total of 26 correct answers in the pre-test (mean = 4.3). After the lesson, participating students got a total of 39 correct answers (mean = 6.5). The standard deviation was 3.1 in the pre-test, and 1.2 in the post-test. Cohen's d = 0.936 (large effect size). Cohen's d was calculated using the formula: d = (M1 – M2) / SDpooled. The knowledge test indicated an improvement of 31% units

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