A Combined Family of Ratio Estimators for Population Mean using an Auxiliary Variable in Simple Random Sampling - Jaroengeratikun, Uraiwan; Department of Applied Statistics, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, 10800 (ITB Journal Publisher, LPPM ITB, 2019)