Among several unbiased estimators of the same population parameter, the most efficient estimator is the one with the:
Correct answer: A. Smallest variance
- A. Smallest variance
- B. Largest sample mean
- C. Highest population value
- D. Greatest sampling fraction
Explanation
Efficiency among unbiased estimators is judged by variance. The estimator with the smallest variance produces the most precise estimates over repeated samples.
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