J.O. Muili, A. Audu , A.B. Odeyale , and I.O. Olawoyin. “Ratio Estimators for Estimating Population Mean Using Tri-Mean, Median and Quartile Deviation of Auxiliary Variable”. NIPES - Journal of Science and Technology Research 1, no. 1 (March 25, 2019). Accessed December 22, 2024. https://journals.nipes.org/index.php/njstr/article/view/26.