Tools

Intervals & Tests

Confidence Intervals

Hypothesis Testing

Hypothesis Test Of Sample Mean Example

Hypothesis Test Of Two Sample Variances Example

Hypothesis Test Of A Standard Deviation Compared To A Standard Value Example

Resampling (Bootstrapping)

Tolerance intervals

Distributions

Properties of Distributions

Level of Significance

Normal Distributions

Area Under the Standard Normal Curve

Central limit theorem

Johnson Distributions

Non-Normal Distributions in the Real World

Weibull Distribution

Folded-Normal Distribution

Rayleigh Distribution for True Position

Critical Values of the t Distribution

Chi-Square Distribution

Process Sigma based on Moving Range

The process sigma of the subgroups selected for analysis.

σx = $images\ebx_-555629893.jpg$ / 1.128

where MR-bar is the Average Moving Range and d2=1.128.

See also:

Process Sigma based on Range Chart

Process Sigma based on Sigma Chart

Learn more about the Statistical Inference tools for understanding statistics in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, in his online Intro. to Statistics short course (only $89) or his online Black Belt certification training course ($875).