Q.An estimator is sample statistics used to estimate a :

Contains all sample information about the parameter $\Rightarrow$ sufficient estimator.

The desirable properties of a good estimator are unbiasedness, consistency, efficiency and sufficiency. Sufficiency is the property that the estimator captures all t …

An estimator is a sample statistic that provides an estimate of an unknown population parameter.

In statistical inference, a population parameter (e.g. population mean $\mu$, proportion $P$) is unknown. A sample statistic computed from observed data (e.g. sample mean $\bar{x}$) that is used to estimate such a parameter is called …