Estimation of measurement uncertainty in chemical analysis

9.7. Step 7 – Combined standard uncertainty

Calculating the combined standard uncertainty 
http://www.uttv.ee/naita?id=17643

https://www.youtube.com/watch?v=v6JZT2PkE-M

Numerical calculation of the uncertainty components: the Kragten method 
http://www.uttv.ee/naita?id=17721

https://www.youtube.com/watch?v=qRx8cFVitgk

The initial XLS file (i.e. containing only the data but not the calculations) used in this example and the XLS file containing the also the combined standard uncertainty (and expanded uncertainty) calculation according to the Kragten’s approach can be downloaded from here:


uncertainty_of_photometric_nh4_determination_kragten_initial.xls
uncertainty_of_photometric_nh4_determination_kragten_solved.xls
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