Liliana Margarita Vitola Garrido, Jhon Jairo Feria Diaz and Boris A. Medina Salgado (2023) “EXPERIMENTAL DESIGN FOR MEASURING 9TH GRADE STUDENTS’ PERFORMANCE IN MATHEMATICS”, Journal of Population Therapeutics and Clinical Pharmacology, 30(12), pp. 510–515. doi:10.53555/jptcp.v30i12.6547.