Designation:D1749–93(Reapproved2002)AnAmericanNationalStandardTechnicalAssociationofthePulpandPaperIndustryStandardMethodT1200osStandardPracticeforInterlaboratoryEvaluationofTestMethodsUsedwithPaperandPaperProducts1ThisstandardisissuedunderthefixeddesignationD1749;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thepurposeofaninterlaboratorystudyistodeterminethevariabilityinresultscausedbydifferencesamonglabora-toriesfollowingaprescribedtestmethod,theconsistencyfrommaterialtomaterialofthisvariability,andthetypeofaddi-tionalstandardizationneeded,ifany.Thestudymaybemadetoobtaininformationforimprovingthetestmethodortoarriveatanestimateoftheprecisionofanexistingmethodforpublication.Itmayalsoincludeacomparisonofalternativetestmethods.1.2Toachievetheobjectivesin1.1satisfactorily,itisessentialthatasoundstatisticaldesignbeemployedintheplanningofaninterlaboratorystudy.Thispracticegivesthebasicprinciplesinvolvedintheplanninginordertomakethedataamenabletostatisticalanalysisandinterpretation.1.3Thispracticehasbeenwrittenforthetaskgroupchairmanresponsibleforthepreparationortherevisionofastandardtestmethod.Ittellshimwhatinformationheneedsinordertoproperlyplananinterlaboratorystudy(Sections1-10),itoutlinestheprocedureforconductingthestudy(Section11),anditgiveshimbackgroundinformationforunderstandingtheanalysis(Section12)andinterpretation(Sections13-15)oftheresults.1.4Whiletheservicesofastatisticianarenotabsolutelynecessaryforthedesign,analysis,andinterpretationofinter-laboratorystudies,questionsoftenarisethatcouldbereadilyansweredbyastatisticianfamiliarwiththeanalysisusedherein.Hence,thetaskgroupchairmanshouldarrangewhen-everpossibletoconsultwithastatisticianbothduringtheplanningandduringtheanalysisandinterpretation.1.5ThispracticeissimilartoTAPPIT1200,whichdetail...
