Liliana Margarita Vitola Garrido, Jhon Jairo Feria Diaz, Boris A. Medina Salgado. EXPERIMENTAL DESIGN FOR MEASURING 9TH GRADE STUDENTS’ PERFORMANCE IN MATHEMATICS. J Popl Ther Clin Pharmacol. 2023;30(12):510-515. doi:10.53555/jptcp.v30i12.6547