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Basic QC

Basic QC MLT

QuestionAnswer
standard deviation square root of the variance
mean arithmetic average
coefficient of variation standard deviation divided by the mean
shift six results on one side of mean
trend six results in one direction
1 2s rule 1 control exceeds 2 SD (warning rule)
1 3s rule 1 control exceeds 3 SD (reject rule)
2 2s rule 2 control levels exceed 2 SD (reject rule)
R 4s rule 2 control levels in same run exceed 4 SD in opposite directions (reject rule)
4 1s rule 4 control levels exceed 1 SD on same side of mean
10 x rule 10 control levels on the same side of the mean
warning rule evaluate other rules if no other rule is violated, run is accepted
reject rule reject run and troubleshoot to find problem
Created by: pambj
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