Six Sigma - Wikipedia
Six Sigma Statistics Descriptive Statistics Measures of Central Tendency Measures Range: The range of a set of data is the difference between the largest and. This is the reason why a 6σ (Six Sigma) process performs better than 1σ, 2σ, 3σ, 4σ, 5σ processes. Obviously Six Sigma stands for 6 standard deviations (6σ) between avarage and acceptable limits. LSL and What is Descriptive Statistics ?. items The Relationship Between Lean Six Sigma and Organizational. Performance: An Empirical .. Table Descriptive Statistics of Quality Performance.
The American Society for Quality long ago established certificates, such as for reliability engineers.
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Crosby pointed out that the Six Sigma standard does not go far enough  —customers deserve defect-free products every time. For example, under the Six Sigma standard, semiconductors which require the flawless etching of millions of tiny circuits onto a single chip are all defective, he claims.
Critics have argued there is overselling of Six Sigma by too great a number of consulting firms, many of which claim expertise in Six Sigma when they have only a rudimentary understanding of the tools and techniques involved or the markets or industries in which they are acting. The statement was attributed to "an analysis by Charles Holland of consulting firm Qualpro which espouses a competing quality-improvement process ".
In most cases, more attention is paid to reducing variation and searching for any significant factors and less attention is paid to developing robustness in the first place which can altogether eliminate the need for reducing variation.
A possible consequence of Six Sigma's array of P-value misconceptions is the false belief that the probability of a conclusion being in error can be calculated from the data in a single experiment without reference to external evidence or the plausibility of the underlying mechanism. The volume of criticism and rebuttal has filled books with language seldom used in the scholarly debate of a dry subject.
Furthermore, errors in prediction are likely to occur as a result of ignorance for or distinction between epistemic and other uncertainties.
These errors are the biggest in time variant reliability related failures. Dodge states  "excessive metrics, steps, measurements and Six Sigma's intense focus on reducing variability water down the discovery process.
Under Six Sigma, the free-wheeling nature of brainstorming and the serendipitous side of discovery is stifled. The differences arise at the goal level themselves: Six Sigma aims at improving process capability and eliminating process variations whereas Lean aims at particularly reducing wastes.
Six Sigma makes use of statistical metrics but Lean is based on comparison of best practices and the current. Lean Six Sigma works great if efficiency alone as an issue.
Article: Difference between - Six Sigma and Lean Six Sigma
It is assumed that the efficiencies they attain will repay the efforts. As a result, the ones with the best ROI are tackled in first place.Descriptive Statistics Vrs Inferential Statistics - Measure of Central tendency Mean, Median, Mode
As the time passes and since the experts are on duty, the cost of implementation remains unchanged. There are two types of specification limits.
Basic Statistics for Six Sigma projects
The first one is the lower specification limit, abbreviated as LSL and this is the lowest acceptable limit as set by a customer. The second one one is the upper specification limit, abbreviated as USL and this is the highest acceptable limit as set by a customer. Note that these limits are generally given by the customer.
These are the most important Six Sigma statistics terms. The further the specification spread from the process spread, the higher process capability would be. In other words, the lesser the variation the higher would be the process capability.
What is the relationship between Six Sigma and Management Information Systems (MIS)?
Defects mean failing to deliver what customer wants. Defective means the failing of the entire product or service. Please remember that one defective product may have a multiple number of defects but the existence of a defect does not necessarily mean the product is defective. Six Sigma statistics is used to determine the extent of defects and defectives.