ISO INTERNATIONAL STANDARD 3086 Fourth edition 2006-04-15 Iron ores Experimental methods for checking the bias of sampling Minerais de fer Methodes expérimentales de controle de I'erreur systematique d'échantillonnage Reference number ISO 3086:2006(E) ISO @ ISO 2006 ISO 3086:2006(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below ?ISO2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, Iso's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2006 - All riahts reserved ISO 3086:2006(E) Contents Page Foreword. 1 Scope 2 Normative references 3 Terms and definitions. 4 Principle ... 5 General conditions . 6 Sampling and sample preparation methods 6.1 Sampling.... 6.2 Sample preparation . 7 Analysis ofexperimentaldata.. 7.1 Computation of the differences. 7.2 Determination of the mean and the standard deviation of the differences . 7.3 Test for outliers - Grubbs' test... 7.4 Selection of data for use in statistical test for bias. 7.4.1 Consideration of outliers whose causes are assignable..... 7.4.2 Consideration of outliers whose causes are not assignable 7.4.3 Consideration of amount of data remaining ... 7.5 Statistical testfor bias.. 7.5.1 Determination of the confidence interval for d 7.5.2 Interpretation of confidence interval ... 8 Test report . Annex A (normative) Flowsheets of the statistical analysis... Annex B (informative) Numerical examples of experiments. "ahts reserved ii ISO 3086:2006(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 3086 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee sc 1, Sampling. Thisfourtheditioncancelsand replacesthethirdedition(isO3086:1998),whichhasbeentechnicallyrevised @ ISO 2006 - All riahts reserved ISO 3086:2006(E) INTERNATIONAL STANDARD Iron ores Experimental methods for checking the bias of sampling 1 Scope This International Standard specifies experimental methods for checking the bias of sampling of iron ores, when sampling is carried out in accordance with the methods specified in isO 3082, having as reference a stopped-belt sampling method. bias testing. Sampling systems not completely in accordance with so 3082 are not always expected to be biased Therefore, bias checking may be done when th