Basic QC MLT
Quiz yourself by guessing what should be in
each of the black rectangles below before clicking
on it to display the answer.
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| Flap 1 |
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| Flap 2 |
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| 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 |
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