ØThe quantity being determined is defined
by Y
lParameters (inputs) used to describe Y
are X1, X2, X3 É Xi.
lThese quantities are estimated by the
terms y, x1, x2, x3 Éxi.
ØUncertainties
lThe standard uncertainty of an input is
u(xi)
lThe combined standard uncertainty is uc(y),
lThe expanded uncertainty is the value
which is reported.