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 |1
Data |and |Statistics
Learning |Objectives
1. Obtain |an |appreciation |for |the |breadth |of |statistical |applications |in |business |and
economics.
|
2. Understand |the |meaning |of |the |terms |elements, |variables, |and |observations |as |they |are
used |in |statistics.
|
3. Obtain |an |understanding |of |the |difference |between |categorical, |quantitative, |cross-
sectional, |and |time-series |data.
|
4. Learn |about |the |sources |of |data |for |statistical |analysis |both |internal |and |external |to |the
firm.
|
5. Be |aware |of |how |errors |can |arise |in |data.
6. Know |the |meaning |of |descriptive |statistics |and |statistical |inference.
7. Be |able |to |distinguish |between |a |population |and |a |sample.
8. Understand |the |role |a |sample |plays |in |making |statistical |inferences |about |the |population.
9. Know |the |meaning |of |the |term |data |mining.
10. Be |aware |of |ethical |guidelines |for |statistical |practice.
Solutions:
1. Statistics |can |be |referred |to |as |numerical |facts. |In |a |broader |sense, |statistics |is |the |field |of
© |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 |dealing |with |the |collection, |analysis, |presentation |and |interpretation |of |data.
2. a. | | The |10 |elements |are |the |10 |tablet |computers
b. Five | variables: |Cost |($), |Operating |System, |Display |Size |(inches), |Battery |Life
(hours), |and |CPU |Manufacturer
|
c Categorical |variables: Operating |System |and |CPU |Manufacturer
Quantitative |variables: Cost |($), |Display |Size |(inches), |and |Battery |Life |(hours)
d.
Variable Measurement |Scale
Cost |($) Ratio
Operating |system Nominal
Display |size |(inches) Ratio
Battery |life |(hours) Ratio
CPU |manufacturer Nominal
3. a. | | Average |cost |= |5829/10 |= |$582.90
b. Average |cost |with |a |Windows |operating |system |= |3616/5 |= |$723.20
Average |cost |with |an |Android |operating |system |= |1,714/4 |= |$428.5
|
The |average |cost |with |a |Windows |operating |system |is |much |higher.
|
c. Ten |of |10 |or |20% |use |a |CPU |manufactured |by |TI |OMAP
d. Four |of |10 |or |40% |use |an |Android |operating |system
4. a. | There |are |eight |elements |in |this |data |set; |each |element |corresponds |to |one |of |the |eight
models |of |cordless |telephones.
|
b. Categorical |variables: |Voice |Quality |and |Handset |on |Base
© |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 |variables: |Price, |Overall |Score, |and |Talk |Time
c. Price: |ratio |measurement
Overall |score: |interval |measurement
Voice |quality: |ordinal |measurement
|
Handset |on |base: |nominal |measurement
|
Talk |time: |ratio |measurement
|
5. a. | | Average |price |= |545/8 |= |$68.13
b. Average |talk |time |= |71/8 |= |8.875 |hours
c. Percentage |rated |Excellent: 2 |of |8, |2/8 |= |.25, |or |25%
6. a. | | Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a. | | Because |there |are |five |choices, |the |response |is |a |categorical |response.
b. The |five |responses |are |the |labels |for |the |customer |responses. |A |nominal |scale |is |being
used.
|
8. a. | | 762
b. Categorical
c. Percentages
d. .67(762) |= |510.54
510 |or |511 |respondents |said |they |want |the |amendment |to |pass.
9. a. | | The |population |is |employed |individuals |in |the |United |States |aged |25–29.
© |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 |you |earned |a |bachelor’s |degree |(or |higher)?
c. Because |the |response |is |yes |or |no, |the |response |is |categorical.
10. a. | | Categorical
b. Percentages
c. 44 |of |1080 |respondents, |approximately |4%, |strongly |agree |with |allowing |drivers |of
motor |vehicles |to |talk |on |a |hand-held |cell |phone |while |driving.
|
d. 165 |of |the |1,080 |respondents |or |15% |of |said |they |somewhat |disagree |and |741 |or |69%
said |they |strongly |disagree. |Thus, |there |does |not |appear |to |be |general |support |for
|
allowing |drivers |of |motor |vehicles |to |talk |on |a |hand-held |cell |phone |while |driving.
|
11. a. | | Since |these |are |years, |categorical.
b. .53(1,503) |= |796.59 |or |approximately |797
c. .10(1,503) |= |150.3 |or |approximately |150
12. a. | | The |population |is |all |visitors |coming |to |the |state |of |Hawaii.
b. Because |airline |flights |carry |the |vast |majority |of |visitors |to |the |state, |the |use |of
questionnaires |for |passengers |during |incoming |flights |is |a |good |way |to |reach |this
|
population. |The |questionnaire |actually |appears |on |the |back |of |a |mandatory |plants |and
|
animals |declaration |form |that |passengers |must |complete |during |the |incoming |flight. |A
|
large |percentage |of |passengers |complete |the |visitor |information |questionnaire.
|
c. Questions |1 |and |4 |provide |quantitative |data |indicating |the |number |of |visits |and |the
number |of |days |in |Hawaii. |Questions |2 |and |3 |provide |categorical |data |indicating |the
|
categories |of |reason |for |the |trip |and |where |the |visitor |plans |to |stay.
|
13. a. | | Facebook |worldwide |advertising |revenue.
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 |1
Data |and |Statistics
Learning |Objectives
1. Obtain |an |appreciation |for |the |breadth |of |statistical |applications |in |business |and
economics.
|
2. Understand |the |meaning |of |the |terms |elements, |variables, |and |observations |as |they |are
used |in |statistics.
|
3. Obtain |an |understanding |of |the |difference |between |categorical, |quantitative, |cross-
sectional, |and |time-series |data.
|
4. Learn |about |the |sources |of |data |for |statistical |analysis |both |internal |and |external |to |the
firm.
|
5. Be |aware |of |how |errors |can |arise |in |data.
6. Know |the |meaning |of |descriptive |statistics |and |statistical |inference.
7. Be |able |to |distinguish |between |a |population |and |a |sample.
8. Understand |the |role |a |sample |plays |in |making |statistical |inferences |about |the |population.
9. Know |the |meaning |of |the |term |data |mining.
10. Be |aware |of |ethical |guidelines |for |statistical |practice.
Solutions:
1. Statistics |can |be |referred |to |as |numerical |facts. |In |a |broader |sense, |statistics |is |the |field |of
© |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 |dealing |with |the |collection, |analysis, |presentation |and |interpretation |of |data.
2. a. | | The |10 |elements |are |the |10 |tablet |computers
b. Five | variables: |Cost |($), |Operating |System, |Display |Size |(inches), |Battery |Life
(hours), |and |CPU |Manufacturer
|
c Categorical |variables: Operating |System |and |CPU |Manufacturer
Quantitative |variables: Cost |($), |Display |Size |(inches), |and |Battery |Life |(hours)
d.
Variable Measurement |Scale
Cost |($) Ratio
Operating |system Nominal
Display |size |(inches) Ratio
Battery |life |(hours) Ratio
CPU |manufacturer Nominal
3. a. | | Average |cost |= |5829/10 |= |$582.90
b. Average |cost |with |a |Windows |operating |system |= |3616/5 |= |$723.20
Average |cost |with |an |Android |operating |system |= |1,714/4 |= |$428.5
|
The |average |cost |with |a |Windows |operating |system |is |much |higher.
|
c. Ten |of |10 |or |20% |use |a |CPU |manufactured |by |TI |OMAP
d. Four |of |10 |or |40% |use |an |Android |operating |system
4. a. | There |are |eight |elements |in |this |data |set; |each |element |corresponds |to |one |of |the |eight
models |of |cordless |telephones.
|
b. Categorical |variables: |Voice |Quality |and |Handset |on |Base
© |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 |variables: |Price, |Overall |Score, |and |Talk |Time
c. Price: |ratio |measurement
Overall |score: |interval |measurement
Voice |quality: |ordinal |measurement
|
Handset |on |base: |nominal |measurement
|
Talk |time: |ratio |measurement
|
5. a. | | Average |price |= |545/8 |= |$68.13
b. Average |talk |time |= |71/8 |= |8.875 |hours
c. Percentage |rated |Excellent: 2 |of |8, |2/8 |= |.25, |or |25%
6. a. | | Categorical
b. Quantitative
c. Categorical
d. Quantitative
e. Quantitative
7. a. | | Because |there |are |five |choices, |the |response |is |a |categorical |response.
b. The |five |responses |are |the |labels |for |the |customer |responses. |A |nominal |scale |is |being
used.
|
8. a. | | 762
b. Categorical
c. Percentages
d. .67(762) |= |510.54
510 |or |511 |respondents |said |they |want |the |amendment |to |pass.
9. a. | | The |population |is |employed |individuals |in |the |United |States |aged |25–29.
© |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 |you |earned |a |bachelor’s |degree |(or |higher)?
c. Because |the |response |is |yes |or |no, |the |response |is |categorical.
10. a. | | Categorical
b. Percentages
c. 44 |of |1080 |respondents, |approximately |4%, |strongly |agree |with |allowing |drivers |of
motor |vehicles |to |talk |on |a |hand-held |cell |phone |while |driving.
|
d. 165 |of |the |1,080 |respondents |or |15% |of |said |they |somewhat |disagree |and |741 |or |69%
said |they |strongly |disagree. |Thus, |there |does |not |appear |to |be |general |support |for
|
allowing |drivers |of |motor |vehicles |to |talk |on |a |hand-held |cell |phone |while |driving.
|
11. a. | | Since |these |are |years, |categorical.
b. .53(1,503) |= |796.59 |or |approximately |797
c. .10(1,503) |= |150.3 |or |approximately |150
12. a. | | The |population |is |all |visitors |coming |to |the |state |of |Hawaii.
b. Because |airline |flights |carry |the |vast |majority |of |visitors |to |the |state, |the |use |of
questionnaires |for |passengers |during |incoming |flights |is |a |good |way |to |reach |this
|
population. |The |questionnaire |actually |appears |on |the |back |of |a |mandatory |plants |and
|
animals |declaration |form |that |passengers |must |complete |during |the |incoming |flight. |A
|
large |percentage |of |passengers |complete |the |visitor |information |questionnaire.
|
c. Questions |1 |and |4 |provide |quantitative |data |indicating |the |number |of |visits |and |the
number |of |days |in |Hawaii. |Questions |2 |and |3 |provide |categorical |data |indicating |the
|
categories |of |reason |for |the |trip |and |where |the |visitor |plans |to |stay.
|
13. a. | | Facebook |worldwide |advertising |revenue.
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.
