Institute of Educational

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The aim of this study was to investigate the efficacy of educational interventions on students' critical thinking and Comparison of this effect in elementary, junior and high school students by using meta-analysis method based on the Hunter and Schmidt approach. Fifteen studies which were accepted methodologically and conducted within the last 10 years in Iran were included in the meta-analysis. The checklist of meta-analysis with 1222 participants were used. The results indicated that the effect size of educational interventions on students' critical thinking was 0/43. The effect size in elementary, junior and high school students was 0/32, 0/45 and 0/61. Also, the results of modulatory analysis showed the efficacy of moderating variables in these interventions. Based on the results of the present meta-analysis, the effect of educational interventions on students' critical thinking according to Cohen's table was above average. This effect rate was evaluated moderate in elementary students, above average in junior high school students and high in secondary school students. The effect of moderating variables in elementary school was higher than the first and second secondary school.

Keywords: critical thinking, Meta-analysis, Hunter and Schmidt approach

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