Among several unbiased estimators of the same population parameter, the most efficient estimator is the one with the:
Correct answer: C. Smallest variance
- A. Highest population value
- B. Largest sample mean
- C. Smallest variance
- 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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Sampling covers population and sample, sampling frames, simple random, systematic, stratified, cluster and convenience methods, along with sampling and non-sampling errors. Estimation includes sample statistics, population parameters, point estimates, confidence intervals and margins of error, with attention to how sample size affects precision.
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