Pre test check; Pretest

Question Pretest Foreach ofthefollowingstatewhichtest ismostappropriatetothesituation.Be sureto specifytheexacttest.Forexampleapairedt-testwouldnot beappropriateinthesame circumstancesasanindependentt-test.Andkeepinmindthat?test?mayapplytoawide rangeofproceduresincludingforexampleconfidenceintervalsorcorrelations. 1.Astudyisconductedtodetermineiftimeofdayhasanyeffectontestgrades.Anintroductory psychologyclassisselectedforthestudybecauseit hasastandardcurriculumtaughtacross manysections.Twoclassesare selectedfor eachtimeperiod:8:00AM1:00PMand5:30 PM.Outofthetotalpoolofaround40studentsforeachtimeperiod15studentsareselectedat randomforatotalof45.Thetestisadministeredtoallstudentsandthetestresultsforthe studysubjectsareplacedinSPSS.Wewanttoknowifthereisastatisticaldifferencebetween thesetimeperiods.Whattestisappropriate? (5pts) 2.Hicks lawpredictshowlong itwilltakea usertopickoutagivenelementonawebsitepage fromamongalltheotherelementsonthatpage.Becauseacertainwebsitewillbeusedmany thousandsoftimesperyearonanintranetamajorcompanyengagesausabilityspecialistto testwhethertheHickspredictionholdsontwoproposedhomepagedesigns.Becausethe companyisreluctantto havetoomanyemployeesabsentfromworkstationsitspecifiesthat the testcaninvolveonlyfiveindividualsandthatthereforethesamefivepeoplemusttestboth proposedinterfaces.Wewillwanttoknowif thereisasignificantdifferenceinthetimesfor eachinterface.Whatistheappropriatetest? (5pts) 3.Laparoscopicsurgeryisa procedurefor threadingasmallflexibletubewithina patient?sbody toexploreorperformprocedures.Arecentstudywasconductedtoseewhatskillsamedical studentnewtolaparoscopicsurgerymighthavethatwouldpredictshorterlearningtimes.One variablethatwasgatheredwastheamountoftimeastudenthadspentplayingvideogames beforestartinghislaparoscopictraining.Theresearcherwantstoseeifthetimespentgaming canpredictthetimeneededtoperfectlaparoscopicskills.Whatwouldbethecorrecttestto apply? (5pts) 4.Alargecompanyisconcernedaboutturnoversoitcommissionsasurveythatwillbegivento arandomgroupof1000employees.Thecompanythenwantstogetageneralideaofwhatthe resultswouldbeinthelargerpopulationbutwhileitwilllookatsignificanceindicatorsitis notheavilyinterestedinsignificancebutinanestimateofcompany-wideresults.Whattest wouldbepropertorunhere? (5pts) Astudyisconductedintotimemissedfromworkcomparedwithoutsidetemperature.A randomsampleof50employeesisextractedfromthehumanresourcesattendance databaseandacorrelationisconducted.Thereisfoundtobeanrof.311atanalphaof.05 two-tailed. 5.Whatis thecriticalvalueofrforthepreviousparagraph? (5pts) 6.Isther fromquestion5significant? (5pts) Refertothetablebelow.It givestwosetsoffiguresa predictedrainfallamountfroma radarimageandanactualrainfallamountasmeasuredbyastandardraingauge. (X)RadarRainPrediction (Y)RainGauge 3.6 .0 2.0 1.2 1.1 1.2 1.3 1.3 1.8 1.4 2.1 1.4 3.2 2.0 2.7 2.1 2.5 2.5 3.5 2.9 3.9 4.0 3.5 4.9 6.5 6.2 7.3 6.6 6.4 7.8 7.Using the dataaboveandtheformulasnexttothetablecalculaterforthedatasetusingthe methodofleastsquares.(Youmay useanothersetofformulasifyoulikebuttheseare relativelysimple.)Showyourwork.Usethebackofthesheetsif necessary. (10pts) 8.Interpretther valueofproblem7.Bethorough. (5pts) 9.Statether2valueofproblem7andinterpret.Bethoroughinyourinterpretation (5pts) 10.WhatistheYinterceptforthedatafromproblem7? (5pts) 11.Whatistheconfidenceintervalof problem7forX=3.5withalphaof.05? (10pts) 12.Whatisthepredictionintervalof problem7forX=3.5withalphaof.05? (10pts) Refertothefollowingchartsandtablesforthenextquestions. Thisisacomparisonofaveragefemalelifeexpectancyaroundtheworldcomparedwith theinfantmortalityrates. 200.0 150.0 100.0 50.0 0.0 40 50 60 70 80 Averagefemalelifeexpectancy 13.Whatisthenofthe samplesfrom theanalysisshownabove? (5pts) 14.Is theassociation(correlation)inthedataabovepositiveornegative? (5pts) 15.Writethecompleteregressionequationforthemodelabove.Donotincludetherandomerror term. (5pts) 16.Isregressionorcorrelationanappropriatetestforthedatasetabove?Explain. (10pts) ExtraCredit(upto10pts) Asurveywastakenaboutwhetherstudentsandstaffparkedinlotsorparkedingarages.The tasknowis toseeif the differencesaresignificantandwhateverelsethedatacanreveal. Calculatethechi-squarealongwiththecriticalvalueandsignificanceofthefollowingdata. Showyourwork.Interprettheresultasthoroughlyasyoucan. Instructors Students Totals ParkedinLots 80 68 ParkedinGarages 45 57 Totals

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