An improvement in estimating the population mean by using the correlation coefficient

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An Efficient Class of Estimators for the Population Mean Using Auxiliary Information (2013, methodology): “Recently, Koyuncu and Kadilar (2009a,b) adopt the same procedure as adopted earlier by Searls (1964) and Prasad (1989) and Khoshnevisan et al.’s (2007) class of estimators, suggested a class of estimators for population mean Y of the study variable y and studied its properties in simple random sampl”
Estimation of Population Mean Using Co-Efficient of Variation and Median of an Auxiliary Variable (2012, background): “For a more detailed discussion on the ratio estimator and its modifications one may refer to Cochran[1], Kadilar and Cingi[2,3], Koyuncu and Kadilar[4], Murthy[5], Prasad[6], Rao[7], Singh and Tailor[9, 11], Singh et.al[10], Sisodia and Dwivedi[12], Subramani and Kumarapandiyan [13,14,15,16,17], Upa”
Neutrosophic ratio-type estimators for estimating the population mean (2021, methodology): “The known parameters or other known statistics were used as auxiliary variables by various researchers [18, 24, 25].”