Choose the best answer to fill in the blank. If an estimator is unbiased, then __________________
i. the estimator is equal to the true value.
ii. the estimator is usually close to the true value.
iii. the mean of the estimator is equal to the true value.
iv. the mean of the estimator is usually close to the true value.
(iii) By definition, an estimator is unbiased if its mean is equal to the true value
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