[DpR]

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I don't do stats much, but isn't it 1.92? I hope not, because that is what I've been using, and I'd much prefer a lower number.

response to dpr*

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I think you meant 1.96. Regardless, that is for 95% confindence for a two sided test (i.e. your win rate is greater than x but less than y). For a 1 sided test the 95% z-value is the same as for the 90% 2 sided test.