Statistical processing the results of interlaboratory testing the grain-size distribution of sand and gravel from the western part of the Kostolac basin

Abstract

This paper presents the results of interlaboratory testing the grain-size distribution of sand and gravel on representative samples from the site of the western part of the Kostolac Basin. The results were statistically processed by two ways: Numerical method: the Cochran test of accuracy and Graphic interpretation: the MANDEL technique of consistency in accordance with the Standard SRPS ISO 5725-2 [1,2]. The followings were calculated: repeatability variance Sr2; interlaboratory variance SL 2 and reproducibility variance SR 2. Samples were submitted by sharing method to all participating laboratories.

U radu su prikazani rezultati međulaboratorijskog ispitivanja granulometrijskog sastava peska i šljunka, na reprezentativnim uzorcima, sa lokaliteta zapadnog dela kostolačkog basena. Rezultati su statistički obrađeni na dva načina i to: Numeričkom metodom: Cochran-ov test preciznosti i Grafičkom interpretacijom: MANDEL-ova tehnika konzistentnosti u skladu sa standardom SRPS ISO 5725-2 [1,2]. Izračunate su: Varijansa ponovljivosti Sr2; međulaboratorijska varijansa SL 2 i varijansa obnovljivosti SR 2. Uzorci su metodom deljenja dostavljeni svim laboratorijama učesnicama.