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In most cases a parameter, eg Y, is not measured directly, but is

determined from

N

other input quantities

X

1

,

X

2

,

….

,

X

N

, through a functional relationship

f

:

The input quantities

X

1

,

X

2

, ...,

X

N

are – of course – also subject to

probability distribution.

1 2

N

Y f ( X , X ,.....X )

Combined uncertainty