An unbiased estimator is a sample statistic whose expected value equals the population parameter.

Unbiased Estimator

A statistical estimator whose expected value is equal to the parameter it estimates, indicating it does not overestimate or underestimate the true value.

Population Parameter

A Population Parameter is a value that represents a characteristic of an entire population, such as its mean or standard deviation.

Sample Statistic

A numerical measure calculated from a set of data extracted from a larger population, used to estimate population parameters.