Montgomery (1996) points out that a moving range chart should be interpreted with care because "the moving ranges are correlated, and this correlation may often induce a pattern or runs or cycles on ...

Each observation contains the diameter measurement and identification number for a particular engine. The variable ENGINE identifies the sequence of engines and is referred to as the subgroup-variable ...

In this module, you will learn how to define a process and break it down into components for the purpose of identifying potential sources of variation. You will learn how to classify variation into ...