从品质上说，毫无疑问，施行高税额已经减少了抽烟现象，但是就是如此说法，从统计学观点来看也很难确定究竟是什么导致了真正的减少。
Qualitatively there is no doubt that higher taxes have reduced smoking, but with that said, it's very difficult from a statistical standpoint to figure out what caused the real reduction.
而六西格玛理论是一套建立在统计学基础上的质量管理系统模式，它的本质是不断减少偏差，持续追求高品质。
Then Six Sigma quality theory is a statistically based quality management system. Its essence is to continuously reduce variance and pursue higher quality.
在产品质量控制过程中，按统计学观点产品已发生的故障与元器件检测筛选之间存在某种内在的关系。
In the process of quality control, certain interrelations exist between product faults and the inspection and selection of the related parts based on statistics theory.
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