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六西格玛统计018 - 双样本均值检验，2-sample Z和2-sample t检验
双样本均值检验的三种类型，2-sample Z和2-sample t和welch t检验，实行2-sample t检验的条件，举例介绍2-sample t的计算
麦粮六西格玛统计17/96
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