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QuestionThetableshowshowallstudentstraveltoschoolAsanormalpracticesamplingfractionisconsideredtobenegligibleifitis(a)morethan5%(b)less than≤5%(c)Morethan%(d)noneSystematicsamplingisusedCreatedDate/10/AMCorbettmaths–Videos,worksheets,a-dayandmuchmorestrata,andthen drawingasampleindependentlyfromeachstratum,isknownasstratifiedsampling(1)(3)K©CorbettmathsOverStepFirst,weneedtoestablishhowmany peoplewereattheconventionYearstudentsYearstudentsYearstudentsEverypotentialsampleunitmustbeassignedtoonlyonestratumandnounitscanbe excludedAstratifiedsampletakesasampleinproportiontothenumberinacategoryAschoolwantsastratifiedsampleofstudentsAstherearealotmore YearstudentsthanYearorstudents,astratifiedsampleensuresarepresentativesampleKhanAcademyisanonprofitwiththemissionofprovidingafree,worldclasseducationforanyone,anywhereThenumbersheshouldsamplefromthe–groupis(a)ExplainwhyitisappropriatetotakeastratifiedsampleDefinitionIf thesampledrawnfromeachstratumisrandomone,theSamplingInstructionsUseblackinkorball-pointpen.\dfrac{\textcolor{blue}{}}{\textcolor {limegreen}{1,}}\times=StratifiedSampling.Howmanyfromyeardotheneed?Addingupthenumbers,weget.QuestionAstratifiedsamplekeepsthesamplein thesameproportionsasthepopulation\text{totalpopulation}=++++=1,StepWemustapplytheformulashownaboveQuestion2Bernardidestotakea stratifiedsampleCalculatethenumberofvisitorstoeachcountrythatshouldbeselectedIfthepopulationishomogeneouswithrespecttothecharacteristicunder study,thenthemethodofsimplerandomsamplingwillyieldahomogeneoussample,andAstratifiedrandomsampleisoneobtainedbydividingthepopulation elementsintomutuallyexclusive,non-overlappinggroupsofsampleunitscalledstrata,thenselectingasimplerandomsamplefromwithineachstratum(stratumis singularforstrata)YearStudentsstudentsintotalareinyearwemultiply xbythesamplesizeRoundtothenearestwholenumberbecauseyoucannot Corbettmaths–Videos,worksheets,a-dayandmuchmoreReviewrelatedarticles/videosoruseahint.Animportantobjectiveinanyestimationproblemisto obtainanestimatorofapopulationparameterwhichcantakecareofthesalientfeaturesofthepopulationSoonecandivideallthestudentsintodifferent subpopulationsorstratasuchasStudentsofclass1,andStratumStudentsofclass4,andStratumStudentsofclass7,AstratiiedsampleofisplannedBernardtakesa stratifiedsampleof(b)CalculatethenumberofeachagegroupthatBernardshouldchooseWorkoutIfpencilisusedfordiagrams/sketches/graphsitmustbe dark(HBorB)FillintheboxesatthetopofthisStratifiedsamplinginvolvessplittingthesampleframeintosmallergroupsorStrataandusingthesestratato ‘weight’thesamplechosenaccordinglytorepresenttheoriginalStratifiedSamplingAnswersLearnforfreeaboutmath,art,computerprogramming,economics, physics,chemistry,biology,medicine,finance,history,andmore