STATISTICAL ANALYSIS OF BIASED TRAIN PASSENGER SATISFACTION USING THE SERVQUAL METHOD. Management Studies and Business Journal (PRODUCTIVITY), [S. l.], v. 2, n. 6, p. 2650–2658, 2025. DOI: 10.62207/w445b872. Disponível em: https://journal.ppipbr.com/index.php/productivity/article/view/709.. Acesso em: 28 oct. 2025.