Study of approaches to determining the required number of multiple observations

The necessity to determine the minimum number of observations when developing a measurement procedure in accredited test and calibration laboratories is discussed. methods evaluating expanded uncertainty using GUM method, Monte Carlo based on Law propagation are considered. In first case, nomogram constructed that allows determining required multiple given values for probability 0.9545, standard deviation scattering indications measuring instrument normally propagated instrumental type B. case calculating Monte-Carlo normal law Student’s with characteristics was modelled, its basis, 0.95, diagram calculate performing measurements constructed. application proved be most universal observations, since it made possible obtain approximating expressions both probabilities uniform laws attributed components