2. How do you know whether a deviation in product characteristics is a "normal" variation of a statistical nature, or whether it is due to a process malfunction caused by an assignable cause that needs to be corrected?
We invite you to consult the fact sheet on Statistical quality control: the concept of process centring and dispersion
remind you of the concepts of statistical dispersion of values, normal distribution and dispersion represented by the standard deviation;
review how to calculate the mean and standard deviation of a normal distribution.
In what follows, we'll assume that the distribution of the value of the product characteristic...
The Ultimate Scientific and Technical Reference
This article is included in
Quality manager
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
How do you know whether a deviation in product characteristics is a "normal" variation of a statistical nature, or whether it is due to a process malfunction caused by an assignable cause that needs to be corrected?
How do you draw up a control chart to apply statistical process control to a product's target value?
Bibliography
Also in our database
Websites
fr.wikipedia.org Wikipedia article on normal distribution, with links to numerical tests to check whether a population follows a normal distribution.
The Ultimate Scientific and Technical Reference
