Empirical Analysis of the Effect of Classical Education on Critical Thinking Skills: A Study of Nigerian Secondary Graduates

The claim that classical education, through training in classical languages, logical argumentation, and close textual analysis, develops superior critical thinking skills is widely asserted but empirically tested only in non-African educational contexts. This study empirically investigates the relationship between classical education and critical thinking skills among Nigerian secondary school graduates. A quasi-experimental design was adopted, comparing critical thinking assessment scores between three groups: graduates of secondary schools with strong Classical Studies programmes (n=120), graduates of schools with minimal Classical Studies (n=120), and graduates of schools with no Classical Studies (n=120), drawn from Lagos, Enugu, and Kano States. The Watson-Glaser Critical Thinking Appraisal (WGCTA) was administered to all three groups alongside a contextual background questionnaire. Analysis of covariance controlled for socioeconomic status, gender, and general academic performance. Results confirm a statistically significant positive association between classical education exposure and overall WGCTA scores (F=22.4, p<0.001), with the strongest effects on the inference, recognition of assumptions, and deduction sub-scales. The effect size (Cohen's d=0.68) indicates a substantial practical difference. The study fills an important empirical gap in African educational research on classical learning outcomes and provides data-driven advocacy evidence for curriculum investment in Classical Studies in Nigerian secondary education. Keywords: classical education, critical thinking, Nigerian secondary schools, empirical study, Watson-Glaser