On improving ratio/product estimator by ratio/product-cum-mean-per-unit estimator targeting more efficient use of auxiliary information

To achieve a more efficient use of auxiliary information we propose single-parameter ratio/product-cum-mean-per-unit estimators for a finite population mean in a simple random sample without replacement when the magnitude of the correlation coefficient is not very high (less than or equal to 0.7). the first order large sample approximation to the bias and the mean square error of our proposed estimators are obtained. we use simulation to compare our estimators with the well-known sample mean,ratio,and product estimators,as well as the classical linear regression estimator for efficient use of auxiliary information. the results are conforming to our motivating aim behind our proposition. © 2014 angela shirley et al.