1. Explain in your own words why this is an effective guideline for SPC (Statist
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1. Explain in your own words why this is an effective guideline for SPC (Statistical Process Control).
DETECTION RULE ONE: a lack of control is indicated whenever a single point falls out-side the (three sigma) control limits.
DETECTION RULE TWO: a lack of control is indicated whenever at least two out of three successive values fall on the same side of, and more than two sigma units away from, the central line.
DETECTION RULE THREE: a lack of control is indicated whenever at least four of five successive values fall on the same side of, and more than one sigma unit away from, the central line.
DETECTION RULE FOUR: a lack of control is indicated whenever at least eight successive values fall on the same side of the central line.
Wheeler & Chambers, Understanding Statistical Process Control 3rd: Chap 3: Shewhart's Charts Chap 4: [Foundations of Shewhart's Charts] Do Exercises 3.1, 3.3, 4.2 Show your work so your results can be verified by another manager. Use an effective document and/or spreadsheet layout. Work carefully and use neat unambiguous notation.Explanation / Answer
The main aim of statistical process control is to maintain the control limit with in the specified sigma level.By doing this an organization will improve the process and quality will be maintained. The guideline provided above have contained all the rules of three sigma, two sigma and one sigma which can be applied to know the efficiency of the control chart. To maintain the control limit and make it sure that sample will fall within the control limit, these rules are sufficient to prove it.
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