GMS 401 Lecture Notes - Statistical Process Control, Type I And Type Ii Errors, Control Chart
16 Oct 2011
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Document Summary
Quality control: is an activity that evaluates quality characteristics relative to a standard, and takes corrective action when they do not meet standards. Inspection: appraisal of goods or services against standards. How much/how often: low cost high volume items require little inspection, so automated inspection is used. When there is high human involvement necessitate more inspection. On-site: specialized labs are worth the time and cost, so companies rely on self inspections onsite. Statistical process control spc: statistical evaluation of the output of a process during production. Quality control steps: define the quality characteristics to monitor, measure the characteristics, compare to a standard and evaluate, take corrective action if necessary. Variations and control: random variation: natural variations in the output of process, created by countless minor factors, assignable variation: a variation whose source can be identified. Control chart: a time ordered plot of sample statistics, used to distinguish between random and non random variability.
