Control Chart for Variables Case Studies

Control Chart for Variables is visualised in this video. The table giving the constant factors are described. The use of constants in finding Upper Control Limits (UCL) and Lower Control Limits (LCL) for both R Chart and X bar Chart are explained in detail. Three case studies are taken for explaining the different methods for Control Chart preparation and analysis. You will be surprised to note that the significance of points outside control limits are not always bad! Situations where assignable causes need to be investigated and the observed deviations must be incorporated in the standard practice as an improvement over the past practice.