公共英語五級閱讀文章《統(tǒng)計學(xué)》

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Statistics

Thereweretwowidelypergentinfluencesontheearlydevelopmentofstatisticalmethods.StatisticshadamotherwhowasdedicatedtokeepingorderlyrecordsofgovernmentalunitsstateandstatisticscomefromthesameLatinrootstatusandagentlemanlygamblingfatherwhoreliedonmathematicstoincreasehisskillatplayingtheoddsingamesofchance.Theinfluenceofthemotherontheoffspring,statistics,isrepresentedbycounting,measuring,describing,tabulating,ordering,andthetakingofcensusesallofwhichledtomoderndescriptivestatistics.Fromtheinfluenceofthefathercamemoderninferentialstatistics,whichisbasedsquarelyontheoriesofprobability.

Descriptivestatisticsinvolvestabulating,depictinganddescribingcollectionsofdata.Thesedatamaybequantitativesuchasmeasuresofheight,intelligenceorgradelevelvariablesthatarecharacterizedbyanunderlyingcontinuumorthedatamayrepresentqualitativevariables,suchassex,collegemajororpersonalitytype.Largemassesofdatamustgenerallyundergoaprocessofsummarizationorreductionbeforetheyarecomprehensible.Descriptivestatisticsisatoolfordescribingorsummarizingorreducingtocomprehensibleformthepropertiesofanotherwiseunwieldymassofdata.

Inferentialstatisticsisaformalizedbodyofmethodsforsolvinganotherclassofproblemsthatpresentgreatdifficultiesfortheunaidedhumanmind.Thisgeneralclassofproblemscharacteristicallyinvolveattemptstomakepredictionsusingasampleofobservations.Forexample,aschoolsuperintendentwishestodeterminetheproportionofchildreninalargeschoolsystemwhocometoschoolwithoutbreakfast,havebeenvaccinatedforflu,orwhatever.Havingalittleknowledgeofstatistics,thesuperintendentwouldknowthatitisunnecessaryandinefficienttoquestioneachchild:theproportionfortheentiredistrictcouldbeestimatedfairlyaccuratelyfromasampleofasfewas100children.Thus,thepurposeofinferentialstatisticsistopredictorestimatecharacteristicsofapopulationfromaknowledgeofthecharacteristicsofonlyasampleofthepopulation.

附：公共英語五級閱讀理解有什么解題技巧?

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