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**eigenvector11** Well the thing is, I don't think the question wants us to show any work, since it says that we don't have to formally calculate the Variances. I know that one estimator is more efficient than the other if it's variance is less. But without actually finding the variances of the estimators, I am unsure of how to answer this question. Intuitively, I would say that 6*Y_min would be more efficient, since taking the least value of a set of numbers and multiplying by 6 would be less than taking the largest and multiplying by (6/5). I would think that my prof is looking for more of a sophisticated answer than this though.