Quality Formulas Flashcards
1
Q
Standard Deviation
A
Shows how far the measurement is from the mean (average).
FORMULA => St Dev = (P-0)/6
2
Q
Sigma
A
These values represent the pure math value, without factoring in process variance which can be up to 1.5 Sigma.
1 Sigma=68.26%
2 Sigma=95.46%
3 Sigma=99.73%
6 Sigma=99.9999998% or 99.9997%
3
Q
RTY- Rolled throughput yield
A
RTY=Y1 xY2xY3c…Yn
