https://solnotes.com/2016/10/08/simple-stats-in-abtesting/
https://mp.weixin.qq.com/s?__biz=MzU1ODEzNjI2NA==&mid=2247487223&idx=1&sn=306598fda6c931e7fbf023cf07959f20&source=41#wechat_redirect
https://mp.weixin.qq.com/s?__biz=MzU1ODEzNjI2NA==&mid=2247487225&idx=1&sn=3598f1caf4d3fd5c4a77962a9f86f692&source=41#wechat_redirect
说通ABTest的数学逻辑
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