N. Madu P, O. Olatayo T, I. Ogunyinka P. Improved Mixed Estimator Using Two Auxiliary Variables For Full Extreme Maximum And Minimum Values In Single Phase Sampling. IQJOSS [Internet]. 2025 Jun. 25 [cited 2025 Aug. 6];21(1):190-21. Available from: https://rjps.uomosul.edu.iq/index.php/stats/article/view/20594