Assignment_1_suggested_solutions

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1、SpeakingofStatistics(12)-Assignment1–SuggestedSolution1.Belowwelistseveralvariables.Whichofthesevariablesarequantitativeandwhicharequalitative?Explain.a.Thedollaramountonanaccountsreceivableinvoice.àQuantitativeb.Thenetprofitforacompanyin2005.àQuantitativec.Thestockexchangeonwhichacompany

2、’sstockistraded.àQualitatived.ThenationaldebtoftheUnitedStatesin2005.àQuantitativee.Theadvertisingmedium(radio,television,orprint)usedtopromoteaproduct.àQualitative2.Classifyeachofthefollowingqualitativevariablesasordinalornominative.Explainyouranswers.QualitativeVariablesTheCorresponding

3、CategoriesStatisticscourselettergradeABCDFàOrdinalPersonalcomputerownershipYesNoàNominalRestaurantrating***************àOrdinalIncomingtaxfilingstatusMarriedfilingjointly;Marriedfilingseparately;Single;Headofhousehold;Qualifyingwidow(er)àNominal3.ForbesmagazinepublishestheForbesPlatinum40

4、0–alistofthe“BestBigCompaniesinAmerica”asselectedbythemagazine’swritersandeditors.TableabovegivesthebestcompaniesintheretailingindustryasgiveninthislistontheForbeswebsiteonMarch16,2005.(Datainthelastpage).b.Organizedataoftheprofitmarginpercentagesintoafrequencydistribution.NumberofclassK=

5、6(Sincewherenisthetotalnumberofdata=35.)TheclasslengthiscalculatedasClassFrequencyRelativeFrequencyPercentageFrequency1.1-4.9140.4040.0%5.0-8.8170.4948.6%8.9-12.730.098.6%12.8-16.600.000.0%16.7-20.500.000.0%20.6-24.410.032.9%a.Constructastem-andleafdisplayofthereturnoncapitalpercentagesfo

6、rtheretailersinPage11of11Table.Findthemedianandthendescribethedistributionofthereturn.Themedianisthe18thmeasurement,15.4.Thedataarewidelyspreadout,withmajorityfallingintherange[8.3,22.8].Thedistributionissomewhatsymmetric,withextremevaluesatbothends.c.Constructahistogramoftheprofitmarginp

7、ercentages.Page11of111.Inordertocontrolcosts,acompanywishestostudytheamountofmoneyitssalesforcespendsentertainingclients.Thefollowingisarandomsampleofsixentertainingexpenses(dinnercostsforfourpeople)fromexpensereportssubmittedbymembersofthesalesforce$157$132$109$145