Question: Instead of using WLS, the researcher in the previous problem decides to compute the OLS estimator using only the observations for which (x leq 10),

Instead of using WLS, the researcher in the previous problem decides to compute the OLS estimator using only the observations for which $x \leq 10$, then using only the observations for which $x>10$, and then using the average the two OLS of estimators. Is this estimator more efficient than WLS?

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