正態分布易于理解, 具有特性, 統計學提供了許多基于正態分布的強有力的分析方法來幫助人們做決定.
因此, 我們通常會試圖用正態分布去近似模擬其它分布 (如可能) 或轉化數据以“使”它遵從正態分布.
它是分析過程能力的首選分布形式.
正態分布的一些特性
A normal distribution can be completely described by knowing only the:
Mean (m)
Variance (s2)
正態分布的一些特性
正態分布的一些特性
The mean, median and mode all coincide at the same value - m. There is perfect symmetry.

正態分布的一些特性
The area under sections of the curve can be used to estimate the cumulative probaBIlity of a certain “event” occurring:

正態分布的一些特性
Let’s compute the cumulative probaBIlitIEs of the following distributions:
正態分布的一些特性
minitab:
Calc ð ProbaBIlity Distributions ð Normal...

The Focus of Six Sigma
Identifying critical aspects of the business with problems or opportunitIEs for improvement.
Targeting those critical areas and designating improvement efforts as Six Sigma Black Belt projects.
Selecting top people to work on the projects--full time.
Ensuring these people have the time, tools, and resources they need to succeed.