Abstract

In this paper a class of ratio-type estimator has been proposed by using unknown constant to estimate population mean of the study variable. The proposed estimator includes a number of estimators. The particular cases of proposed estimator have been discussed. The expression for bias and the MSE of the proposed estimator were derived up to the first order of approximation. The efficiency of the proposed estimator has been compared with the estimators that are particular cases of proposed estimator and condition under which the proposed estimator is more efficient is derived. Appropriate Numerical illustrations are used to determine the efficiency of proposed estimator and existing estimators.

Key words: Bias, Efficiency, Estimator, Mean square error