Until now, various types of estimators have been used for estimating the population variance
in simple random sampling studies, including ratio, product, regression and exponential …

We improve two families of unbiased estimators in general form for estimating the finite
population mean in stratified random sampling. These estimators are developed from the …

The article deal with the class unbiased forms of the variance estimators using Hartley–Ross
type in the simple random sampling. The mean squared error (since it is an unbiased …

In this article, we consider a new family of exponential type estimators for estimating the
unknown population mean of the study variable. We propose estimators taking advantage of …