2174-2175 / 2239
A last remark on the probability range of uncertainty:
We know: The combined (standard) uncertainty is the positive square root
The coverage factor and expanded uncertainty
of the sum of variances weighted according to how the result is influenced
by varying different influence components (if not correlated).
2
2
c
N
i
f
u
u ( x )
x
∂
= +
⋅
∂
∑
If this standard uncertainty is used as the quoted range, then the
measurand lies within
ξ
±
σ
with a probability of 67%.
1
i
i
=
86