ZARAGOZA ALVARADO, Guillermo Alejandro. Chapter 4. Grouping to Understand: How to Analyze Data Presented in Intervals. In: Descriptive statistics manual. Definition and exercises. [s.l.] : AG Editor,2025. p. 44–48. DOI: 10.62486/978-628-97230-1-4.ch04. Disponível em: https://books.ageditor.org/index.php/books/catalog/book/978-628-97230-1-4/chapter/15. Acesso em: 10 dec. 2025.