Explain why it is important to separate sources of variability into special or assignable causes and common or chance causes.
Answer to relevant QuestionsWhat is the Juran Trilogy? It has been estimated that safe aircraft carrier landings operate at about the 5s level. What level of ppm defective does this imply? What are chance and assignable causes of variability? What part do they play in the operation and interpretation of a Shewhart control chart? If a process is in a state of statistical control, does it necessarily follow that all or nearly all of the units of product produced will be within the specification limits? Consider the yield data in Table 4E.3. Construct a time-series plot for these data. Interpret the plot.
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