2182-2183 / 2239
5.2
(5) If this probability distribution is not known and the only available
information is a sample of
random realizations,
then the best
estimate of the measurand is
the mean value
of the random
realizations.
(6) The corresponding standard uncertainty is the positive square root of
the
estimate
of the variance of the
mean value
.
(7) The combined uncertainty is given by the following formula:
2
N
∂
90
(8) The
expanded uncertainty
is the product of the
coverage factor
and standard uncertainty.
2
c
1
i
i
i
f
u
u ( x )
x
=
= +
⋅
∂
∑