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variable control charge xar and R charge this is chapter five in this chapter weamp;#39;re going to understand the xbar and R chart and how to build them and how to use them to understand if a process is in control or out of control so we use the xar in our charge when we have variable data data that we can measure we can bring into decimal uh values and we have a small sample size this mean and less done 10 so how do we build an xar in our charge for the first step is to select equality characteristic an equality characteristic must be measurable and can be expressed in numbers and it can be expressed in term of the seven basic units length mass time electrical current temperature systems or intensity and as well it can be any of the deride units such as power velocity Force energy density and pressure so once you have this quality characteristic which you know that is the one that is affecting the performance of the product or service and um you need now to choose the rational subgr
