SelectandDrawConclusions75选择和得出的结论

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1、Lesson7.5SelectandDrawConclusionsfromSamplesAugust16th2012p.268Vocabulary1)Population:groupofpeoplethatyouwantinformationaboutEx:sophomoresBrookwoodStudentsstudentsinGwinnettCountyregisteredvotersVocabulary2)Sample:part/subsetofpopulationA)Randomsample:everym

2、emberhasanequalchanceofbeingselectedB)Self-selectedsample:peoplevolunteerresponsesC)Systematicsample:ruleselectsmembersD)Conveniencesample:easy-to-reachmembersVocabulary3)Unbiasedsample:representsthepopulation4)Biasedsample:overorunderestimatesthepopulation.E

3、x:InasamplethatincludesallBHSstudents,youonlypollseniorsExampleOne:ClassifySamples1)LunchHabits:Abusinessreporterwantstosurveyworkersaboutwheretheyeatlunchduringatypicalworkweek.Identifythetypeofsampledescribedasaself-selected,systematic,convenienceorrandomsa

4、mpleandtellwhetherornotitisbiasedorunbiased.A)Thereporterwritesacolumnaskingworkerstocallaspecialphonenumberandidentifywheretheyeatlunchduringatypicalworkweek.__________________Isthisbiasedorunbiasedsampling?_________________________________Self-selectedUnbia

5、sedB)Thereporteraskseveryoneinthenewsroomwheretheyeatlunchduringatypicalworkweek.__________________Isthisbiasedorunbiasedsampling?_________________________________ConvenienceBiasedCLASSWORK…trythese8problemsp.269#’s1-2p.270#’s1-3p.271#’s1-3Keepyourpaperoutwh

6、enyoufinish.We’llchecktheanswersontheboard!P.2691)Systematic2)Unbiased,itrepresentsthepopulationP.2701)Random;Unbiased2)Convenience;Biased3)Systematic;BiasedP.2711)Self-selected;Unbiased2)Convenience;Biased3)Random;Unbiased