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Frequently Asked Question - Definition of Common Cleanroom Terms
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Confidence Levels The statistical methods presented in this appendix are highly dependent upon the selection of desired confidence level. The confidence level choosen for a given cleanroom parameter represents the statistical confidence of meeting the desired level for that parameter. More simply, but less precisely the confidence level represents the desired probability of the parameter meeting the described levels. General guidelines are 1. As a minimum, a 90% confidence level can be used for areas deemed noncritical 2. For more critical areas, a confidence level of 95% should be used 3. For extremely sensitive or critical areas, a confidence level of 99% should be used |
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