BSIS STUDY GUIDE EXAM #1 QUESTIONS WITH
CORRECT ANSWERS
The |heights |of |women |ages |18 |to |24 |have |a |mean |of |64.5 |inches |and |a |standard |deviation |of |
2 |inches. |Suppose |you |have |a |female |friend |that |is |20 |years |old |and |is |66 |inches |tall. |How |
many |standard |deviations |does |she |fall |above |the |mean |height |for |women |age |18 |to |24?
0.75
1
1.5
1.75
Feedback: |Correct. |Recall |that |a |z-score |indicates |how |many |standard |deviations |a |given |value |
falls |away |from |the |mean. |This |question |is |asking |you |to |calculate |a |z-score. |The |woman's |z-
score |= |(sample |- |mean)/standard |deviation, |so |(66 |- |64.2)/2 |= |0.75.
quantitative |data
if |numeric |and |arithmetic |operations |such |as |addition |subtraction |multiplication |and |division |
can |be |performed |on |them
categorical |data
Data |that |consists |of |names, |labels, |or |other |nonnumerical |values( |can't |perform |arithmetic |
operations)
cross |sectional |data
collected |from |several |entities |at |the |same |or |approximately |the |same |point |in |time
,time |series |data
collected |over |several |time |periods
frequency |distribution
a |summary |of |data |that |shows |the |number( |frequency) |of |observations |in |each |of |several |non |
overlapping |classes |aka |bins
details:
1. |count |how |many |times |each |item |appears |for |observations |(categorical |data) |aka |frequency
relative |frequency |distribution
Frequency |of |the |bin( |# |of |times |item |shows |up |in |set/ |n( |total |number |in |set)
3 |steps |for |a |frequency |distribution |with |quantitative |data
1. |determine |the |number |of |non |overlapping |bins
2. |determine |the |width |of |each |bin
3. |determine |the |bin |limits
, bins
created |to |show |variability |in |data
goal |is |to |use |enough |bins |to |show |the |variation |in |the |data |but |not |so |many |that |contain |only
|a |few |data |items
stick |between |5-20 |bins
width |of |bins
width |be |the |same |for |each |bin
largest |data |value |- |smallest |data |value/ |number |of |bins
bin |limits
must |be |chosen |so |that |each |data |item |belongs |to |one |and |only |one |class
lower |and |upper |bin |limit |assigns |lowest |possible |and |biggest |allowed |in |each |class
Histogram
A |graph |of |vertical |bars |representing |the |frequency |distribution |of |a |set |of |data.
CORRECT ANSWERS
The |heights |of |women |ages |18 |to |24 |have |a |mean |of |64.5 |inches |and |a |standard |deviation |of |
2 |inches. |Suppose |you |have |a |female |friend |that |is |20 |years |old |and |is |66 |inches |tall. |How |
many |standard |deviations |does |she |fall |above |the |mean |height |for |women |age |18 |to |24?
0.75
1
1.5
1.75
Feedback: |Correct. |Recall |that |a |z-score |indicates |how |many |standard |deviations |a |given |value |
falls |away |from |the |mean. |This |question |is |asking |you |to |calculate |a |z-score. |The |woman's |z-
score |= |(sample |- |mean)/standard |deviation, |so |(66 |- |64.2)/2 |= |0.75.
quantitative |data
if |numeric |and |arithmetic |operations |such |as |addition |subtraction |multiplication |and |division |
can |be |performed |on |them
categorical |data
Data |that |consists |of |names, |labels, |or |other |nonnumerical |values( |can't |perform |arithmetic |
operations)
cross |sectional |data
collected |from |several |entities |at |the |same |or |approximately |the |same |point |in |time
,time |series |data
collected |over |several |time |periods
frequency |distribution
a |summary |of |data |that |shows |the |number( |frequency) |of |observations |in |each |of |several |non |
overlapping |classes |aka |bins
details:
1. |count |how |many |times |each |item |appears |for |observations |(categorical |data) |aka |frequency
relative |frequency |distribution
Frequency |of |the |bin( |# |of |times |item |shows |up |in |set/ |n( |total |number |in |set)
3 |steps |for |a |frequency |distribution |with |quantitative |data
1. |determine |the |number |of |non |overlapping |bins
2. |determine |the |width |of |each |bin
3. |determine |the |bin |limits
, bins
created |to |show |variability |in |data
goal |is |to |use |enough |bins |to |show |the |variation |in |the |data |but |not |so |many |that |contain |only
|a |few |data |items
stick |between |5-20 |bins
width |of |bins
width |be |the |same |for |each |bin
largest |data |value |- |smallest |data |value/ |number |of |bins
bin |limits
must |be |chosen |so |that |each |data |item |belongs |to |one |and |only |one |class
lower |and |upper |bin |limit |assigns |lowest |possible |and |biggest |allowed |in |each |class
Histogram
A |graph |of |vertical |bars |representing |the |frequency |distribution |of |a |set |of |data.
