A statistic T is being evaluated as an estimator for a parameter θ.
Which statement best describes an unbiased estimator?
- Acheck_circle
The mean of its sampling distribution equals the parameter being estimated.
- B
Its sampling distribution is symmetric.
- C
Its standard deviation is small.
- D
It always equals the parameter.
Explanation
An estimator is unbiased when the mean of its sampling distribution equals the population parameter.