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Control Plan

What is a Six Sigma Control Plan and how does it work? The Lean Six Sigma control plan format is a written description of the process. A control plan example would be that it describes the steps required to maintain a process or device at its current level. Each step...

Control Limits

A control limit chart definition is made up of many parts. There are two control limits. The lower limit (LCL) is at the bottom, while the upper limit is at the top. The solid middle line represents the average of all the statistics being...

Contour Plot

A Contour Plot is a two-dimensional graph of three measurement variables: two inputs (x1 and x2) and one response (y), where contour lines connect points on the x1 and x2 plane that have the same value for y. In other words, it is a graphical technique for...

Confounding

Confounding is a crucial concept in research. It describes a situation where a third variable influences both the independent and dependent variables. This creates a spurious association. It makes it seem like the independent variable is causing the dependent...

Confidence Interval in Six Sigma: A Plain-Language Guide

You measure a sample of parts and find the average diameter is 10.2mm. But how reliable is that number? Does it describe the whole process, or just the 30 parts you happened to measure? This is exactly the problem a confidence interval solves. A confidence interval...
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