Copyright©2009CengageLearning1.1ChapterOneWhatisStatistics?Copyright©2009CengageLearning1.2WhatisStatistics?“Statisticsisawaytogetinformationfromdata.”Copyright©2009CengageLearning1.3WhatisStatistics?“Statisticsisawaytogetinformationfromdata”DataStatisticsInformationDefinitions:OxfordEnglishDictionaryStatisticsisatoolforcreatingnewunderstandingfromasetofnumbers.Copyright©2009CengageLearning1.4Example2.6StatsAnxietyAstudentenrolledinabusinessprogramisattendingthefirstclassoftherequiredstatisticscourse.Thestudentissomewhatapprehensivebecausehebelievesthemyththatthecourseisdifficult.Toalleviatehisanxietythestudentaskstheprofessoraboutlastyear’smarks.Theprofessorobligesandprovidesalistofthefinalmarks,whichiscomposedoftermworkplusthefinalexam.Whatinformationcanthestudentobtainfromthelist?Copyright©2009CengageLearning1.5Example2.6StatsAnxiety658172597153856666707271797677686573647282737775808589748683877767807869646779606278599274686369676784697262747368837465Copyright©2009CengageLearning1.6Example2.6StatsAnxiety“Typicalmark”Mean(averagemark)Median(marksuchthat50%aboveand50%below)Mean=72.67Median=72Isthisenoughinformation?Copyright©2009CengageLearning1.7Example2.6StatsAnxietyAremostofthemarksclusteredaroundthemeanoraretheymorespreadout?Range=Maximum–minimum=92-53=39VarianceStandarddeviationCopyright©2009CengageLearning1.8Example2.6StatsAnxietyAretheremanymarksbelow60orabove80?WhatproportionareA,B,C,Dgrades?Agraphicaltechnique–histogramcanprovideuswiththisandotherinformationCopyright©2009CengageLearning1.9Example2.6StatsAnxietyHistogram01020305060708090100MarksFrequencyCopyright©2009CengageLearning1.10DescriptiveStatisticsDescriptivestatisticsdealswithmethodsoforganizing,summarizing,andpresentingdatainaconvenientandinformativeway.Oneformofdescriptivestatisticsusesgraphicaltechniques,whichallowstatisticspractitionerstopresentdatainwaysthatmakeiteasyforthereadertoextractusefulinformation.Chapter2introducesseveralgraphicalmethods.Copyright©2009CengageLe...
