Class Size and Student Achievement: A Parametric Paired t Test. UKH Journal of Social Sciences, [S. l.], v. 2, n. 1, p. 19–24, 2018. DOI: 10.25079/ukhjss.v2n1y2018.pp19-24. Disponível em: https://journals.ukh.edu.krd/index.php/ukhjss/article/view/34.. Acesso em: 5 may. 2024.