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Basic QC
Basic QC MLT
Question | Answer |
---|---|
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 |