An estimator is called unbiased when its:
Correct answer: B. Expected value equals the population parameter
- A. Variance is always equal to zero
- B. Expected value equals the population parameter
- C. Observed value equals every sample value
- D. Standard error increases with sample size
Explanation
An unbiased estimator has an expected value equal to the parameter it estimates. Unbiasedness concerns systematic error and does not require the estimator to have zero variance.
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