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May 3, 2015 at 13:07 history edited Louis CC BY-SA 3.0
Followed my own suggestion and traced through the proof.
Apr 30, 2015 at 22:56 history edited D.W. CC BY-SA 3.0
Define "centered"
Apr 30, 2015 at 22:48 comment added Nicholas Mancuso @D.W., isn't that implicit from "centered"? That is, $X_i$ is centered in [-1, 1], => $E[X_i] = 0$.
Apr 30, 2015 at 22:04 history edited D.W. CC BY-SA 3.0
Fix wording.
Apr 30, 2015 at 7:40 history edited Louis CC BY-SA 3.0
Added independence assumption, discussion of why knowing the expectation helps.
Apr 29, 2015 at 21:26 history answered Louis CC BY-SA 3.0