SOLUTION MANUAL FOR j j
EssentialsjofjStatisticsjforjBusinessj&jEconomicsj9thjEditionjbyjDavidjR.jA
nderson,jDennisjJ.jSweeney,jThomasjA.jWilliams,jJeffreyjD.jCamm,jJames
jJ.jCochran
Chapterj1
DatajandjStatistics
LearningjObjectives
1. Obtainjanjappreciationjforjthejbreadthjofjstatisticaljapplicationsjinjbusinessjandjec
onomics.
2. Understandjthejmeaningjofjthejtermsjelements,jvariables,jandjobservationsjasjtheyjarejus
edjinjstatistics.
3. Obtainjanjunderstandingjofjthejdifferencejbetweenjcategorical,jquantitative,jcross-
jsectional,jandjtime-seriesjdata.
4. Learnjaboutjthejsourcesjofjdatajforjstatisticaljanalysisjbothjinternaljandjexternaljtojthejfir
m.
5. Bejawarejofjhowjerrorsjcanjarisejinjdata.
6. Knowjthejmeaningjofjdescriptivejstatisticsjandjstatisticaljinference.
7. Bejablejtojdistinguishjbetweenjajpopulationjandjajsample.
8. Understandjthejrolejajsamplejplaysjinjmakingjstatisticaljinferencesjaboutjthejpopulation.
9. Knowjthejmeaningjofjthejtermjdatajmining.
10. Bejawarejofjethicaljguidelinesjforjstatisticaljpractice.
Solutions:
1. Statisticsjcanjbejreferredjtojasjnumericaljfacts.jInjajbroaderjsense,jstatisticsjisjthejfieldjof
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, studyjdealingjwithjthejcollection,janalysis,jpresentationjandjinterpretationjofjdata.
2. a.j j Thej10jelementsjarejthej10jtabletjcomputers
b. Fivej variables:jCostj($),jOperatingjSystem,jDisplayjSizej(inches),jBatteryjLifej(h
ours),jandjCPUjManufacturer
c Categoricaljvariables: OperatingjSystemjandjCPUjManufacturer
Quantitativejvariables: Costj($),jDisplayjSizej(inches),jandjBatteryjLifej(hours)
d.
Variable MeasurementjScale
Costj($) Ratio
Operatingjsystem Nominal
Displayjsizej(inches) Ratio
Batteryjlifej(hours) Ratio
CPUjmanufacturer Nominal
3. a.j j Averagejcostj=j5829/10j=j$582.90
b. AveragejcostjwithjajWindowsjoperatingjsystemj=j3616/5j=j$723.20jA
veragejcostjwithjanjAndroidjoperatingjsystemj=j1,714/4j=j$428.5jThej
averagejcostjwithjajWindowsjoperatingjsystemjisjmuchjhigher.
c. Tenjofj10jorj20%jusejajCPUjmanufacturedjbyjTIjOMAP
d. Fourjofj10jorj40%jusejanjAndroidjoperatingjsystem
4. a.j Therejarejeightjelementsjinjthisjdatajset;jeachjelementjcorrespondsjtojonejofjthejeightjmo
delsjofjcordlessjtelephones.
b. Categoricaljvariables:jVoicejQualityjandjHandsetjonjBase
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, Quantitativejvariables:jPrice,jOveralljScore,jandjTalkjTime
c. Price:jratiojmeasurement
Overalljscore:jintervaljmeasurementjVoice
jquality:jordinaljmeasurementjHandsetjonj
base:jnominaljmeasurementjTalkjtime:jrati
ojmeasurement
5. a.j j Averagejpricej=j545/8j=j$68.13
b. Averagejtalkjtimej=j71/8j=j8.875jhours
c. PercentagejratedjExcellent: 2jofj8,j2/8j=j.25,jorj25%
6. a.j j Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a.j j Becausejtherejarejfivejchoices,jthejresponsejisjajcategoricaljresponse.
b. Thejfivejresponsesjarejthejlabelsjforjthejcustomerjresponses.jAjnominaljscalejisjbeingjus
ed.
8. a.j j 762
b. Categorical
c. Percentages
d. .67(762)j=j510.54
510jorj511jrespondentsjsaidjtheyjwantjthejamendmentjtojpass.
9. a.j j ThejpopulationjisjemployedjindividualsjinjthejUnitedjStatesjagedj25–29.
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, b. Havejyoujearnedjajbachelor’sjdegreej(orjhigher)?
c. Becausejthejresponsejisjyesjorjno,jthejresponsejisjcategorical.
10. a.j j Categorical
b. Percentages
c. 44jofj1080jrespondents,japproximatelyj4%,jstronglyjagreejwithjallowingjdriversjofjm
otorjvehiclesjtojtalkjonjajhand-heldjcelljphonejwhilejdriving.
d. 165jofjthej1,080jrespondentsjorj15%jofjsaidjtheyjsomewhatjdisagreejandj741jorj69%jsai
djtheyjstronglyjdisagree.jThus,jtherejdoesjnotjappearjtojbejgeneraljsupportjforjallowingj
driversjofjmotorjvehiclesjtojtalkjonjajhand-heldjcelljphonejwhilejdriving.
11. a.j j Sincejthesejarejyears,jcategorical.
b. .53(1,503)j=j796.59jorjapproximatelyj797
c. .10(1,503)j=j150.3jorjapproximatelyj150
12. a.j j ThejpopulationjisjalljvisitorsjcomingjtojthejstatejofjHawaii.
b. Becausejairlinejflightsjcarryjthejvastjmajorityjofjvisitorsjtojthejstate,jthejusejofjquestionn
airesjforjpassengersjduringjincomingjflightsjisjajgoodjwayjtojreachjthisjpopulation.jThej
questionnairejactuallyjappearsjonjthejbackjofjajmandatoryjplantsjandjanimalsjdeclaratio
njformjthatjpassengersjmustjcompletejduringjthejincomingjflight.jAjlargejpercentagejofjp
assengersjcompletejthejvisitorjinformationjquestionnaire.
c. Questionsj1jandj4jprovidejquantitativejdatajindicatingjthejnumberjofjvisitsjandjthejnu
mberjofjdaysjinjHawaii.jQuestionsj2jandj3jprovidejcategoricaljdatajindicatingjthejcateg
oriesjofjreasonjforjthejtripjandjwherejthejvisitorjplansjtojstay.
13. a.j j Facebookjworldwidejadvertisingjrevenue.
b. Quantitative
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
EssentialsjofjStatisticsjforjBusinessj&jEconomicsj9thjEditionjbyjDavidjR.jA
nderson,jDennisjJ.jSweeney,jThomasjA.jWilliams,jJeffreyjD.jCamm,jJames
jJ.jCochran
Chapterj1
DatajandjStatistics
LearningjObjectives
1. Obtainjanjappreciationjforjthejbreadthjofjstatisticaljapplicationsjinjbusinessjandjec
onomics.
2. Understandjthejmeaningjofjthejtermsjelements,jvariables,jandjobservationsjasjtheyjarejus
edjinjstatistics.
3. Obtainjanjunderstandingjofjthejdifferencejbetweenjcategorical,jquantitative,jcross-
jsectional,jandjtime-seriesjdata.
4. Learnjaboutjthejsourcesjofjdatajforjstatisticaljanalysisjbothjinternaljandjexternaljtojthejfir
m.
5. Bejawarejofjhowjerrorsjcanjarisejinjdata.
6. Knowjthejmeaningjofjdescriptivejstatisticsjandjstatisticaljinference.
7. Bejablejtojdistinguishjbetweenjajpopulationjandjajsample.
8. Understandjthejrolejajsamplejplaysjinjmakingjstatisticaljinferencesjaboutjthejpopulation.
9. Knowjthejmeaningjofjthejtermjdatajmining.
10. Bejawarejofjethicaljguidelinesjforjstatisticaljpractice.
Solutions:
1. Statisticsjcanjbejreferredjtojasjnumericaljfacts.jInjajbroaderjsense,jstatisticsjisjthejfieldjof
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, studyjdealingjwithjthejcollection,janalysis,jpresentationjandjinterpretationjofjdata.
2. a.j j Thej10jelementsjarejthej10jtabletjcomputers
b. Fivej variables:jCostj($),jOperatingjSystem,jDisplayjSizej(inches),jBatteryjLifej(h
ours),jandjCPUjManufacturer
c Categoricaljvariables: OperatingjSystemjandjCPUjManufacturer
Quantitativejvariables: Costj($),jDisplayjSizej(inches),jandjBatteryjLifej(hours)
d.
Variable MeasurementjScale
Costj($) Ratio
Operatingjsystem Nominal
Displayjsizej(inches) Ratio
Batteryjlifej(hours) Ratio
CPUjmanufacturer Nominal
3. a.j j Averagejcostj=j5829/10j=j$582.90
b. AveragejcostjwithjajWindowsjoperatingjsystemj=j3616/5j=j$723.20jA
veragejcostjwithjanjAndroidjoperatingjsystemj=j1,714/4j=j$428.5jThej
averagejcostjwithjajWindowsjoperatingjsystemjisjmuchjhigher.
c. Tenjofj10jorj20%jusejajCPUjmanufacturedjbyjTIjOMAP
d. Fourjofj10jorj40%jusejanjAndroidjoperatingjsystem
4. a.j Therejarejeightjelementsjinjthisjdatajset;jeachjelementjcorrespondsjtojonejofjthejeightjmo
delsjofjcordlessjtelephones.
b. Categoricaljvariables:jVoicejQualityjandjHandsetjonjBase
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, Quantitativejvariables:jPrice,jOveralljScore,jandjTalkjTime
c. Price:jratiojmeasurement
Overalljscore:jintervaljmeasurementjVoice
jquality:jordinaljmeasurementjHandsetjonj
base:jnominaljmeasurementjTalkjtime:jrati
ojmeasurement
5. a.j j Averagejpricej=j545/8j=j$68.13
b. Averagejtalkjtimej=j71/8j=j8.875jhours
c. PercentagejratedjExcellent: 2jofj8,j2/8j=j.25,jorj25%
6. a.j j Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a.j j Becausejtherejarejfivejchoices,jthejresponsejisjajcategoricaljresponse.
b. Thejfivejresponsesjarejthejlabelsjforjthejcustomerjresponses.jAjnominaljscalejisjbeingjus
ed.
8. a.j j 762
b. Categorical
c. Percentages
d. .67(762)j=j510.54
510jorj511jrespondentsjsaidjtheyjwantjthejamendmentjtojpass.
9. a.j j ThejpopulationjisjemployedjindividualsjinjthejUnitedjStatesjagedj25–29.
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
, b. Havejyoujearnedjajbachelor’sjdegreej(orjhigher)?
c. Becausejthejresponsejisjyesjorjno,jthejresponsejisjcategorical.
10. a.j j Categorical
b. Percentages
c. 44jofj1080jrespondents,japproximatelyj4%,jstronglyjagreejwithjallowingjdriversjofjm
otorjvehiclesjtojtalkjonjajhand-heldjcelljphonejwhilejdriving.
d. 165jofjthej1,080jrespondentsjorj15%jofjsaidjtheyjsomewhatjdisagreejandj741jorj69%jsai
djtheyjstronglyjdisagree.jThus,jtherejdoesjnotjappearjtojbejgeneraljsupportjforjallowingj
driversjofjmotorjvehiclesjtojtalkjonjajhand-heldjcelljphonejwhilejdriving.
11. a.j j Sincejthesejarejyears,jcategorical.
b. .53(1,503)j=j796.59jorjapproximatelyj797
c. .10(1,503)j=j150.3jorjapproximatelyj150
12. a.j j ThejpopulationjisjalljvisitorsjcomingjtojthejstatejofjHawaii.
b. Becausejairlinejflightsjcarryjthejvastjmajorityjofjvisitorsjtojthejstate,jthejusejofjquestionn
airesjforjpassengersjduringjincomingjflightsjisjajgoodjwayjtojreachjthisjpopulation.jThej
questionnairejactuallyjappearsjonjthejbackjofjajmandatoryjplantsjandjanimalsjdeclaratio
njformjthatjpassengersjmustjcompletejduringjthejincomingjflight.jAjlargejpercentagejofjp
assengersjcompletejthejvisitorjinformationjquestionnaire.
c. Questionsj1jandj4jprovidejquantitativejdatajindicatingjthejnumberjofjvisitsjandjthejnu
mberjofjdaysjinjHawaii.jQuestionsj2jandj3jprovidejcategoricaljdatajindicatingjthejcateg
oriesjofjreasonjforjthejtripjandjwherejthejvisitorjplansjtojstay.
13. a.j j Facebookjworldwidejadvertisingjrevenue.
b. Quantitative
©j2019jCengagejLearning.jAlljRightsjReserved.jMayjnotjbejscanned,jcopiedjorjduplicated,jorjpostedjtojajpubliclyjaccessiblejwebsite,jinjwholejorjinjpart.
