My client is a laboratory doing analysis of gas mixtures. They may get a gas mixture of multiple gases like oxygen, nitrogen. They compre it with standard known gases using various analysers and then provide gas composition. However there is a certain uncertainty in their results. Uncertainty could be due to various reasons like environment, inaccuracy of analyser, human errors, etc.
The task is to calculate the uncertainty in measurements. More details on this subject can be found here http://www.ukas.com/library/Technical-Information/Pubs-Technical-Articles/Pubs-List/M3003.pdf