Designation:D5791−95(Reapproved2017)StandardGuideforUsingProbabilitySamplingMethodsinStudiesofIndoorAirQualityinBuildings1ThisstandardisissuedunderthefixeddesignationD5791;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverscriteriafordeterminingwhenprob-abilitysamplingmethodsshouldbeusedtoselectlocationsforplacementofenvironmentalmonitoringequipmentinabuild-ingortoselectasampleofbuildingoccupantsforquestion-naireadministrationforastudyofindoorairquality.Someofthebasicprobabilitysamplingmethodsthatareapplicableforthesetypesofstudiesareintroduced.1.2Probabilitysamplingreferstostatisticalsamplingmeth-odsthatselectunitsforobservationwithknownprobabilities(includingprobabilitiesequaltooneforacensus)sothatstatisticallydefensibleinferencesaresupportedfromthesampletotheentirepopulationofunitsthathadapositiveprobabilityofbeingselectedintothesample.1.3Thisguidedescribesthosesituationsinwhichprobabil-itysamplingmethodsareneededforascientificstudyoftheindoorairqualityinabuilding.Forthosesituationsforwhichprobabilitysamplingmethodsarerecommended,guidanceisprovidedonhowtoimplementprobabilitysamplingmethods,includingobstaclesthatmayarise.Examplesoftheirapplica-tionareprovidedforselectedsituations.Becausesomeindoorairqualityinvestigationsmayrequireapplicationofcomplex,multistage,surveysamplingproceduresandbecausethisstan-dardisaguideratherthanapractice,thereferencesinAppendixX1arerecommendedforguidanceonappropriateprobabilitysamplingmethods,ratherthanincludingexposi-tionsofsuchmethodsinthisguide.1.4Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfor...
