SOLUTION MANUAL FOR
Essentials of Statistics for Business & Economics 9th Edition by David R.
Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm,
James J. Cochran
Chapter q1
Data qand qStatistics
Learning qObjectives
1. Obtain qan qappreciation qfor qthe qbreadth qof qstatistical qapplications qin qbusiness
qand qeconomics.
2. Understand qthe qmeaning qof qthe qterms qelements, qvariables, qand qobservations qas qthey
qare qused qin qstatistics.
3. Obtain qan qunderstanding qof qthe qdifference qbetween qcategorical, qquantitative,
q cross- qsectional, qand qtime-series qdata.
4. Learn qabout qthe qsources qof qdata qfor qstatistical qanalysis qboth qinternal qand qexternal qto
qthe qfirm.
5. Be qaware qof qhow qerrors qcan qarise qin qdata.
6. Know qthe qmeaning qof qdescriptive qstatistics qand qstatistical qinference.
7. Be qable qto qdistinguish qbetween qa qpopulation qand qa qsample.
8. Understand qthe qrole qa qsample qplays qin qmaking qstatistical qinferences qabout qthe qpopulation.
9. Know qthe qmeaning qof qthe qterm qdata qmining.
10. Be qaware qof qethical qguidelines qfor qstatistical qpractice.
Solutions:
1. Statistics qcan qbe qreferred qto qas qnumerical qfacts. qIn qa qbroader qsense, qstatistics qis qthe qfield qof
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, study qdealing qwith qthe qcollection, qanalysis, qpresentation qand qinterpretation qof qdata.
2. a. q q The q10 qelements qare qthe q10 qtablet q computers
b. Five q variables: qCost q($), qOperating qSystem, qDisplay qSize q(inches), qBattery
Life q(hours), qand qCPU qManufacturer
q
c Categorical qvariables: Operating qSystem qand qCPU qManufacturer
Quantitative qvariables: Cost q($), qDisplay qSize q(inches), qand qBattery qLife q(hours)
d.
Variable Measurement qScale
Cost q($) Ratio
Operating qsystem Nominal
Display qsize q(inches) Ratio
Battery qlife q(hours) Ratio
CPU qmanufacturer Nominal
3. a. q q Average qcost q= q5829/10 q= q$582.90
b. Average qcost qwith qa qWindows qoperating qsystem q= q3616/5 q=
$723.20 qAverage qcost qwith qan qAndroid qoperating qsystem q=
q
q1,714/4 q= q$428.5 qThe qaverage qcost qwith qa qWindows qoperating
qsystem qis qmuch qhigher.
c. Ten qof q10 qor q20% quse qa qCPU qmanufactured qby qTI qOMAP
d. Four qof q10 qor q40% quse qan qAndroid qoperating qsystem
4. a. q There qare qeight qelements qin qthis qdata qset; qeach qelement qcorresponds qto qone qof qthe
eight qmodels qof qcordless qtelephones.
q
b. Categorical qvariables: qVoice qQuality qand qHandset qon qBase
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, Quantitative qvariables: qPrice, qOverall qScore, qand qTalk qTime
c. Price: qratio qmeasurement
Overall qscore: qinterval qmeasurement
qVoice qquality: qordinal qmeasurement
qHandset qon qbase: qnominal qmeasurement
qTalk qtime: qratio qmeasurement
5. a. q q Average qprice q= q545/8 q= q$68.13
b. Average qtalk qtime q= q71/8 q= q8.875 qhours
c. Percentage qrated qExcellent: 2 qof q8, q 2/8 q= q.25, qor q25%
6. a. q q Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a. q q Because qthere qare qfive qchoices, qthe qresponse qis qa qcategorical qresponse.
b. The qfive qresponses qare qthe qlabels qfor qthe qcustomer qresponses. qA qnominal qscale qis
qbeing qused.
8. a. q q 762
b. Categorical
c. Percentages
d. .67(762) q= q510.54
510 qor q511 qrespondents qsaid qthey qwant qthe qamendment qto qpass.
9. a. q q The qpopulation qis qemployed qindividuals qin qthe qUnited qStates qaged q25–29.
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, b. Have qyou qearned qa qbachelor’s qdegree q(or qhigher)?
c. Because qthe qresponse qis qyes qor qno, qthe qresponse qis qcategorical.
10. a. q q Categorical
b. Percentages
c. 44 qof q1080 qrespondents, qapproximately q4%, qstrongly qagree qwith qallowing qdrivers
qof qmotor qvehicles qto qtalk qon qa qhand-held qcell qphone qwhile qdriving.
d. 165 qof qthe q1,080 qrespondents qor q15% qof qsaid qthey qsomewhat qdisagree qand q741 qor
q69% qsaid qthey qstrongly qdisagree. qThus, qthere qdoes qnot qappear qto qbe qgeneral qsupport
qfor qallowing qdrivers qof qmotor qvehicles qto qtalk qon qa qhand-held qcell qphone qwhile
qdriving.
11. a. q q Since qthese qare qyears, qcategorical.
b. .53(1,503) q= q796.59 qor qapproximately q797
c. .10(1,503) q= q150.3 qor qapproximately q150
12. a. q q The qpopulation qis qall qvisitors qcoming qto qthe qstate qof qHawaii.
b. Because qairline qflights qcarry qthe qvast qmajority qof qvisitors qto qthe qstate, qthe quse qof
qquestionnaires qfor qpassengers qduring qincoming qflights qis qa qgood qway qto qreach qthis
qpopulation. qThe qquestionnaire qactually qappears qon qthe qback qof qa qmandatory qplants
qand qanimals qdeclaration qform qthat qpassengers qmust qcomplete qduring qthe qincoming
qflight. qA qlarge qpercentage qof qpassengers qcomplete qthe qvisitor qinformation
qquestionnaire.
c. Questions q1 qand q4 qprovide qquantitative qdata qindicating qthe qnumber qof qvisits qand
qthe qnumber qof qdays qin qHawaii. qQuestions q2 qand q3 qprovide qcategorical qdata
qindicating qthe qcategories qof qreason qfor qthe qtrip qand qwhere qthe qvisitor qplans qto qstay.
13. a. q q Facebook qworldwide qadvertising qrevenue.
b. Quantitative
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
Essentials of Statistics for Business & Economics 9th Edition by David R.
Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm,
James J. Cochran
Chapter q1
Data qand qStatistics
Learning qObjectives
1. Obtain qan qappreciation qfor qthe qbreadth qof qstatistical qapplications qin qbusiness
qand qeconomics.
2. Understand qthe qmeaning qof qthe qterms qelements, qvariables, qand qobservations qas qthey
qare qused qin qstatistics.
3. Obtain qan qunderstanding qof qthe qdifference qbetween qcategorical, qquantitative,
q cross- qsectional, qand qtime-series qdata.
4. Learn qabout qthe qsources qof qdata qfor qstatistical qanalysis qboth qinternal qand qexternal qto
qthe qfirm.
5. Be qaware qof qhow qerrors qcan qarise qin qdata.
6. Know qthe qmeaning qof qdescriptive qstatistics qand qstatistical qinference.
7. Be qable qto qdistinguish qbetween qa qpopulation qand qa qsample.
8. Understand qthe qrole qa qsample qplays qin qmaking qstatistical qinferences qabout qthe qpopulation.
9. Know qthe qmeaning qof qthe qterm qdata qmining.
10. Be qaware qof qethical qguidelines qfor qstatistical qpractice.
Solutions:
1. Statistics qcan qbe qreferred qto qas qnumerical qfacts. qIn qa qbroader qsense, qstatistics qis qthe qfield qof
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, study qdealing qwith qthe qcollection, qanalysis, qpresentation qand qinterpretation qof qdata.
2. a. q q The q10 qelements qare qthe q10 qtablet q computers
b. Five q variables: qCost q($), qOperating qSystem, qDisplay qSize q(inches), qBattery
Life q(hours), qand qCPU qManufacturer
q
c Categorical qvariables: Operating qSystem qand qCPU qManufacturer
Quantitative qvariables: Cost q($), qDisplay qSize q(inches), qand qBattery qLife q(hours)
d.
Variable Measurement qScale
Cost q($) Ratio
Operating qsystem Nominal
Display qsize q(inches) Ratio
Battery qlife q(hours) Ratio
CPU qmanufacturer Nominal
3. a. q q Average qcost q= q5829/10 q= q$582.90
b. Average qcost qwith qa qWindows qoperating qsystem q= q3616/5 q=
$723.20 qAverage qcost qwith qan qAndroid qoperating qsystem q=
q
q1,714/4 q= q$428.5 qThe qaverage qcost qwith qa qWindows qoperating
qsystem qis qmuch qhigher.
c. Ten qof q10 qor q20% quse qa qCPU qmanufactured qby qTI qOMAP
d. Four qof q10 qor q40% quse qan qAndroid qoperating qsystem
4. a. q There qare qeight qelements qin qthis qdata qset; qeach qelement qcorresponds qto qone qof qthe
eight qmodels qof qcordless qtelephones.
q
b. Categorical qvariables: qVoice qQuality qand qHandset qon qBase
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, Quantitative qvariables: qPrice, qOverall qScore, qand qTalk qTime
c. Price: qratio qmeasurement
Overall qscore: qinterval qmeasurement
qVoice qquality: qordinal qmeasurement
qHandset qon qbase: qnominal qmeasurement
qTalk qtime: qratio qmeasurement
5. a. q q Average qprice q= q545/8 q= q$68.13
b. Average qtalk qtime q= q71/8 q= q8.875 qhours
c. Percentage qrated qExcellent: 2 qof q8, q 2/8 q= q.25, qor q25%
6. a. q q Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a. q q Because qthere qare qfive qchoices, qthe qresponse qis qa qcategorical qresponse.
b. The qfive qresponses qare qthe qlabels qfor qthe qcustomer qresponses. qA qnominal qscale qis
qbeing qused.
8. a. q q 762
b. Categorical
c. Percentages
d. .67(762) q= q510.54
510 qor q511 qrespondents qsaid qthey qwant qthe qamendment qto qpass.
9. a. q q The qpopulation qis qemployed qindividuals qin qthe qUnited qStates qaged q25–29.
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
, b. Have qyou qearned qa qbachelor’s qdegree q(or qhigher)?
c. Because qthe qresponse qis qyes qor qno, qthe qresponse qis qcategorical.
10. a. q q Categorical
b. Percentages
c. 44 qof q1080 qrespondents, qapproximately q4%, qstrongly qagree qwith qallowing qdrivers
qof qmotor qvehicles qto qtalk qon qa qhand-held qcell qphone qwhile qdriving.
d. 165 qof qthe q1,080 qrespondents qor q15% qof qsaid qthey qsomewhat qdisagree qand q741 qor
q69% qsaid qthey qstrongly qdisagree. qThus, qthere qdoes qnot qappear qto qbe qgeneral qsupport
qfor qallowing qdrivers qof qmotor qvehicles qto qtalk qon qa qhand-held qcell qphone qwhile
qdriving.
11. a. q q Since qthese qare qyears, qcategorical.
b. .53(1,503) q= q796.59 qor qapproximately q797
c. .10(1,503) q= q150.3 qor qapproximately q150
12. a. q q The qpopulation qis qall qvisitors qcoming qto qthe qstate qof qHawaii.
b. Because qairline qflights qcarry qthe qvast qmajority qof qvisitors qto qthe qstate, qthe quse qof
qquestionnaires qfor qpassengers qduring qincoming qflights qis qa qgood qway qto qreach qthis
qpopulation. qThe qquestionnaire qactually qappears qon qthe qback qof qa qmandatory qplants
qand qanimals qdeclaration qform qthat qpassengers qmust qcomplete qduring qthe qincoming
qflight. qA qlarge qpercentage qof qpassengers qcomplete qthe qvisitor qinformation
qquestionnaire.
c. Questions q1 qand q4 qprovide qquantitative qdata qindicating qthe qnumber qof qvisits qand
qthe qnumber qof qdays qin qHawaii. qQuestions q2 qand q3 qprovide qcategorical qdata
qindicating qthe qcategories qof qreason qfor qthe qtrip qand qwhere qthe qvisitor qplans qto qstay.
13. a. q q Facebook qworldwide qadvertising qrevenue.
b. Quantitative
© 2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
