Discussion
The precision of OLS estimator is measured by their :
Answer: C
The precision of OLS estimators is measured by their Standard errors.
An estimator's precision describes how tightly its sampling distribution clusters around the true parameter. The standard error is the estimated standard deviation of that sampling distribution: the smaller it is, the more precise the estimate, and it is what confidence intervals and t-tests are built on.
The mean of the sampling distribution concerns unbiasedness, not precision. The mode and the sign of an estimate say nothing about how much it would vary from sample to sample.
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