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. JSTR [Internet]. 2019 Mar. 25 [cited 2024 Oct. 22];1(1). Available from: https://journals.nipes.org/index.php/njstr/article/view/26