2.
Measurement Process Characterization
2.5. Uncertainty analysis 2.5.5. Propagation of error considerations


Case: Y=f(X,Z) 
Standard deviations of reported values that are functions of a
single variable are reproduced from a paper by H. Ku
(Ku).
The reported value, Y, is a function of the average of N measurements on a single variable. 
Notes 
is an average of N measurements 
= standard deviation of X. 
Approximation could be seriously in error if n is small  
Not directly derived from the formulas  Note: we need to assume that the original data follow an approximately normal distribution. 