Ilham, Ronni VelEfendi, RustamSirait, Haposan2014-03-252014-03-252014-03-25Rangga Dwijunanda Putrahttp://repository.unri.ac.id/xmlui/handle/123456789/5864This article discusses three ratio-cum-product estimators forthe population mean using the coefficient of correlation on simple random sampling i.e. ratio-cum-product estimator, dual ratio-cum-product estimator, and combination dual ratio-cum-product estimator. Thethree estimators are biased estimators. Then themean square errors are Determined Furthermore, these mean square errors are compared to the mean square error of each estimator.This comparison shows that the combination dual ratio-cum- product estimator using coefficient of correlationis more efficient than other estimators.otherbiased estimatorcoefficient ofcorrelationdualratio-cum-productmean square errorratio-cum-productOther