| 资料名称： |
6西格玛 |
| 下载级别： |
游客 |
6西格玛
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| 文件类型： |
PPT |
| 资料类型： |
专业档案 |
| 运行环境： |
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| 授权方式： |
免费资料 |
| 金币/集(份)： |
0 |
| 资料大小： |
13K |
| 资料等级： |
 |
| 发布者： |
admin |
| 作 者 ： |
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| 语 种： |
简体中文 |
| 整理时间： |
2005-01-26 |
| 下载次数： |
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| 资料简介： |
6西格玛
Statistics is the branch of science that deals with the collection,
presentation, analysis & interpretation of data for the purpose
of decision-making and problem-solving.
Statistics is a critical skill in quality improvement as statistical
techniques can be used to describe and to understand variability.
Sample
a subset of data from the population
Parameters
numerical measures of a population
Statistics
numerical measures of a sample
Parametric Statistics
- based on the assumption that random samples are selected from populations with a defined (e.g. normal) distribution
Non-Parametric Statistics
- assumes no knowledge whatsoever about the distributions of the underlying populations
- also known as distribution-free statistics
Whether a variable is to be described or be described by other variables.
Response or Dependent Variable
variable under investigation is to be described in terms of other variables
Predictor or Independent Variable
variable is used in conjunction with other variables to describe describe a given response variable
Whether there are gaps between successively observed values of a variable.
Discrete Variable
gaps exist between observations
obtained by counting
Continuous Variable
no gaps exist between observations
obtained by measuring
Deals with preciseness of measurement of the variable.
Nominal Variable
values assumed by a variable indicate different categories
Ordinal Variable
allows not only grouping but also ordering of categories
Interval Variable
meaningful measure of the distance between categories
Ratio or Ratio-Scale Variable
an interval variable that has a scale with a true zero |
6西格玛
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