Data types and basic definitions(英文版)(ppt 21页)

Data types and basic definitions（英文版）内容提要：
Terminology (Continued)：
Importance of Variation:
  1、Our goal is to reduce variation.
  2、We cannot eliminate it, but we can control it.
  3、We use statistics to quantify it and understand its causes.
Reducing variation results in:
  1、Predictable, controllable output.
  2、Improved yields.
  3、Increased profitability.
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