STA 215 Exam #1 Questions with 100% Correct Answers | Verified | Latest Update, Exams of Advanced Education

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STA 215 Exam # 1 Questions with 100% Correct

Answers | Verified | Latest Update

What'sTtheTdifferenceTbetweenTrawTdataTandTdata?T-TCorrectTAnswer- DataTisTrawTdataTthatThasTbeenTcleanedTupTsoTthatTitTcanTbeTanalyzed WhatTdoTweTcallTaTcharacteristicTthatTcanTdifferTfromTindividualTtoTindi vidual?T-TCorrectTAnswer-Variable WhatTisTaTcensus?T-TCorrectTAnswer- AttemptingTtoTcollectTinformationTfromTallTindividualsTinTaTpopulation WhyTdoTweTtypicallyTnotTdoTaTcensus?T-TCorrectTAnswer- VeryTdifficult/expensiveTtoTdo GiveTanTexampleTofTaTparameter.TDoesTthisTvalueTchange?T- TCorrectTAnswer- 45%TofTallTGVSUTstudentsTlikeTtheTcolorTblueTbest.TNo,TitTisTaTfixedTvalu e. GiveTanTexampleTofTaTstatistic.TDoesTthisTvalueTchange?T- TCorrectTAnswer- 42.5%TofTourTclassesTlikeTtheTcolorTblueTbest.TYes,TitTcanTchangeTdepen dingTonTtheTsample.

GiveTanTexampleTofTaTcategoricalTvariable.T-TCorrectTAnswer- FavoriteTpet,TclassTstanding,TeyeTcolor,Tmajor... GiveTanTexampleTofTaTquantitativeTvariableT-TCorrectTAnswer- Height,TnumberTofTshoes,TnumberTofTFacebookTphotos... GiveTanTexampleTofTaTnominalTvariable.T-TCorrectTAnswer- FavoriteTpet,TeyeTcolor,TmajorT(aTcategoricalTvariableTthatTdoesTNOTTh aveTlogicalTorder) .TGiveTanTexampleTofTanTordinalTvariable.T-TCorrectTAnswer- ClassTstanding,TfavoriteTcolorT(aTcategoricalTvariableTthatThasTlogicalTor der) GiveTanTexampleTofTaTdiscreteTvariable.T-TCorrectTAnswer- FacebookTfriends,TFacebookTphotos,TnumberTofTshoes GiveTanTexampleTofTaTcontinuousTvariableT-TCorrectTAnswer- Height,Tdistance,Ttime What'sTtheTmainTdifferenceTbetweenTaTdesignedTexperimentTandTanTo bservationalTstudy?T-TCorrectTAnswer- ATdesignedTexperimentTtreatsTsomeTindividualsTdifferentlyTthanTotherT individuals

TheToutcomeTofToneTtrialTdoesTnotTinfluenceTtheToutcomeTofTanyTothe rTtrial AllTprobabilitiesTneedTtoTbeTbetweenTwhichT 2 Tvalues?T(TheTsameTcanTb eTsaidTforTproportionsTandTpercentagesTasTwell.)T-TCorrectTAnswer- 0 TandT 1 T(orT0%TandT100%) WhatTtypesTofToutputTcanTweTuseTtoTsummarizeToneTcategoricalTvariab le?T(Hint:TthereTareT4.)T-TCorrectTAnswer- FrequencyTtable,TrelativeTfrequencyTtable,TpieTchart,TbarTgraph WhatTletterTorTsymbolTrepresentsTaTpopulationTproportion?T- TCorrectTAnswer-p WhatTletterTorTsymbolTrepresentsTaTsampleTproportion?T- TCorrectTAnswer-p ̂ WhatTisTtheTcenterTofTtheTsamplingTdistributionTofTpT^?T- TCorrectTAnswer-p WhatThappensTtoTtheTspreadTofTtheTsamplingTdistributionTofTasTnTincre ases?TWhy?T(There'sTaTlogicalTargumentTandTaTmathematicalTargumen t.)T-TCorrectTAnswer- TheTspreadTdecreases.TLargerTdataTsetsTproduceTbetterTresultsTandTyo uTareTdividingTbyTnTsoTasTthatTincreasesTtheTresultTwillTdecrease.

WhatTisTinferentialTstatistics?T-TCorrectTAnswer- TakingTsampleTdataTtoTtryTtoTinferTsomethingTaboutTtheTpopulation WhatTareTtheTtwoTmainTtypesTofTstatisticalTinferenceTthatTweTuseTinTst atistics?T-TCorrectTAnswer-ConfidenceTintervalsTandThypothesisTtesting WhatTisTaTconfidenceTinterval?T-TCorrectTAnswer- AnTintervalTofTnumbersTthatTtellsTusTwhereTourTparameterTisTlikelyTloc ated WhatTisTtheToverallTbasicTformulaTforTaTconfidenceTinterval?T- TCorrectTAnswer-sampleTestimateT+/-TmultiplierT*TstandardTerrorT-or- TstatisticT+/-TmarginTofTerror WhatTconditionsTareTneededTtoTsayTthatTourTconfidenceTintervalTisTvali d?T-TCorrectTAnswer- WeTneedTaTrandomTsampleTandTatTleastT 10 TsuccessesTandT 10 Tfailures WhatTpercentageTofTtheTsampleTwasTbornTinTJuly?T-TCorrectTAnswer- 12.1%TorT. FindTaT90%TconfidenceTintervalTforTtheTpercentageTofTallTGVSUTstudent sTthatTwereTbornTinTJuly.T(UseTF15.sav.TYouTmayTassumeTthatTtheTsamp leTisTrandom.)T-TCorrectTAnswer-[.101,T.140]

TeverTeverTeverTeverTeverTeverTeverTeverTeverTeverTeverTeverTeverTever TeverTeverTeverTeverTeverTeverTeverTeverTeverTacceptTHo WhatTisTaTTypeTITError?T-TCorrectTAnswer- ATfalseTpositive.THoTisTtrue,TbutTweTrejectTitTandTacceptTHa .TWhatTisTaTTypeTIITError?T-TCorrectTAnswer- ATfalseTnegative.THaTisTtrue,TbutTweTfailTtoTrejectTHoTandTfailTtoTacceptT Ha. IfTtheTp-valueTisTlessTthanT.05TwhatTisTourTconclusion?T- TCorrectTAnswer-RejectTHoTandTacceptTHa. IfTtheTp-valueTisTgreaterTthanTorTequalTtoT.05TwhatTisTourTconclusion?T- TCorrectTAnswer-WeTfailTtoTrejectTHoTandTfailTtoTacceptTHa WhatTconditionsTareTneededTtoTsayTthatTourThypothesisTtestTisTvalid?T- TCorrectTAnswer- .TWeTneedTaTrandomTsampleTandTatTleastT 10 TsuccessesTandT 10 Tfailures PerformTaThypothesisTtestTtoTproveTthatTtheTpercentageTofTallTGVSUTst udentsTthatTareTbornTinTJulyTisTgreaterTthanT8.3%T(1/12).T- TCorrectTAnswer-AllTconditionsTmet.THo:Tp=.083THa:Tp>.083Tz- stat=3.72Tp-value=.000/2=.

WeTrejectTHoTandTacceptTHa.TTheTpercentageTofTallTGVSUTstudentsTtha tTwereTbornTinTJulyTisTgreaterTthanT8.3%.