Abstract
	The paper describes results of mathematical-statistical analysis of the set of values of creep strength tests of the high-alloyed nickel alloy IN 713 LC. The analysed set of data comprised parameters of creep strength together with the corresponding data about chemical composition. The following characteristics were determined during creep strength tests under strictly defined conditions: time to rupture t (h?, ductility A5 (%? and contraction Z (%?. Three sets of heats with different chemical composition were available. Basic statistical analysis, correlation analysis and multiple regression analysis were used for obtaining information about properties of data sets from individual heats, which can be interpreted as sub-sets, and about properties of the aggregate set of the whole three heats containing 101 items. 
	It was ascertained that dispersion of chemical composition of individual analysed elements manifested in the aggregate set if three heats of the alloy has statistically significant influence on parameters of creep strength of the investigated alloy IN 713 LC.