New unbiased estimators with the help of hartley-ross type estimators

For the population mean,khoshnevisan et al. (2007) demonstrated the family of estimators via information of the known population parameters. later,koyuncu and kadilar (2009) improved this family of estimators. in this study,we suggest a general family of hartley-ross type unbiased estimators developed from the special version of estimators in khoshnevisan et al. (2007) and the family of estimators in koyuncu and kadilar (2009). the variance expressions of the suggested estimators are derived to the first order of approximation. when these findings are compared with the mse values of the mentioned estimators,it is indicated that the proposed estimators are more effective than the estimators given by khoshnevisan et al. (2007) and koyuncu and kadilar (2009) under the determined conditions. furthermore,the obtained results are supported with a numerical demonstration. © 2016 pakistan journal of statistics.