Arifin, Moch. Bahak Udin By, and Aunillah. “Buku Ajar Statistik Pendidikan”. Umsida Press (July 19, 2022): 1 - 102. Accessed May 3, 2024. https://press.umsida.ac.id/index.php/umsidapress/article/view/978-623-6292-33-4.