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Apr 13, 2012 at 0:02 comment added Henry I doubt you can bring the expected length down below $\frac{1}{3}$ for a 50% confidence interval on a sample of 2 items.
Apr 12, 2012 at 1:41 vote accept Xodarap
Apr 12, 2012 at 1:25 vote accept Xodarap
Apr 12, 2012 at 1:40
Apr 11, 2012 at 23:47 history answered StasK CC BY-SA 3.0