Table 5 Change in the students’ intrinsic motivation in the EG between the control lesson (Post-Questionnaire 1) and the last experimental lesson (Post-Questionnaire 2_2) (Wilcoxon signed-rank test)

Md of EG in traditional lesson (SD)

4.57 (1.503)

4.00 (1.391)

4.50 (1.259)

4.57 (1.316)

Md of EG in last experimental lesson (SD)

5.14 (1.462)

4.20 (1.462)

4.50 (1.265)

5.43 (1.526)

N of traditional lesson

462

462

462

462

N of last experimental lesson

240

240

240

240

Number of comparisons

205

205

205

205

Z

− 4.850^a

− 2.642^a

− 1.252^a

− 6.188^a

p-value (2-tailed)

0.000^*

0.008^*

0.211

0.000^*

Cohen’s d

0.494

0.262

0.124

0.643

Hedges’ g

0.493

0.262

0.124

0.642