math 201 - exam 1 with correct answers
Statistics |- |verified |answersA |science |of |collecting, |organizing, |analyzing |and |interpreting |numerical |
information |from |data
Statistics |is |divided |into |2 |parts |- |verified |answers1.Inferential
2.Descriptive
Descriptive |Statistics |- |verified |answersUtilizes |numerical |and |graphical |methods |in |a |data |set, |to |
summarize |the |information |revealed |in |a |data |set, |and |to |present |the |information |in |a |convenient |
form
Inferential |Statistics |- |verified |answersUtilizes |sample |data |to |make |estimates, |decisions, |predictions, |
or |other |generalizations |about |a |population
Population |- |verified |answersThe |entire |body |of |observations |e.g. |people, |objects, |transactions, |or |
events |that |were |interested |in |studying
Example: |ALL |students |taking |Stat |201 |during |winter |session
Sample |- |verified |answersSubset |of |a |population
Variable |- |verified |answersCharacteristic |or |property |of |an |individual |element |of |a |population |to |be |
measured |or |observed |
Example: |Average |heights |of |students |at |UD |- |the |variable |is |heights
Qualitative |Data |- |verified |answers-Attribute |or |categorical
-A |variable |whose |characteristic |is |nonnumeric
-Can |only |be |organized |through |bar |graphs |and |pie |charts
-Example: |gender, |type |fo |car, |eye |color, |etc.
Quantitative |Data |- |verified |answers-Numerical
-Reported |numerically |
-Ex: |minutes |remaining |in |class, |number |of |children |in |a |family |
-Can |be |described |a |discrete |or |continuous
-Can |only |be |organized |through |histograms, |stem-and-leaf |plots, |dot |plots, |and |box |plots
Discrete |Variables |- |verified |answers-Can |only |assume |certain |values, |usually |"gaps" |between |values
, -Example: |Number |of |chairs |in |a |room, |number |of |people |in |a |class, |number |of |tickets |sold |at |the |
movies
Continuous |Variables |- |verified |answers-Can |assume |ANY |value |within |a |specified |range |or |interval
-Example: |pressure |in |a |tire, |the |weight |of |a |pork |chop, |the |heigh |of |students |in |a |class
Sources |of |data |- |verified |answers-Published |data
-Data |obtained |from |an |experiment
-Data |obtained |from |a |survey
-Data |obtained |from |an |observational |study
What |is |the |difference |between |a |Bar |Graph |and |a |Histogram? |- |verified |answersIn |a |bar |graph, |the |
bars |DO |NOT |touch |- |also |histograms |are |for |quantitative |data |and |bar |graphs |are |for |qualitative |data
Pareto |Graph |- |verified |answersA |bar |graph |with |the |categories |of |the |qualitative |(bars) |variables |
arranged |by |heigh |in |ascending |or |descending |order
-The |goal |is |that |it |is |easy |to |locate |the |"most |important" |categories |- |those |with |the |largest |
frequencies
Class |Frequency |- |verified |answersThe |number |of |observations |in |a |data |set |that |fall |into |each |set
Class |Relative |Frequency |- |verified |answersThe |proportion |of |the |total |number |of |observations |falling |
into |each |class |(each |frequency |divided |by |the |total)
Class |Percentage |- |verified |answersThe |class |relative |frequency |multiplied |by |100
Symmetric |Distribution |- |verified |answers-Mode |= |median |= |mean
-Zero |Skewness
-Mound |Shaped
Right |Skewed |Distribution |- |verified |answers-Positively |skewed: |the |mean |and |median |are |to |the |right
|of |the |mode
- |Mean |is |GREATER |than |the |median
- |Mean |> |Median |> |Mode
-Tail |to |the |right
Left |Skewed |Distribution |- |verified |answers-Negatively |skewed: |the |mean |and |the |median |are |to |the |
left |of |the |mode
-Mode |> |Median |> |Mean
-Mean |is |LESS |than |the |median |
-Tail |to |the |left
Statistics |- |verified |answersA |science |of |collecting, |organizing, |analyzing |and |interpreting |numerical |
information |from |data
Statistics |is |divided |into |2 |parts |- |verified |answers1.Inferential
2.Descriptive
Descriptive |Statistics |- |verified |answersUtilizes |numerical |and |graphical |methods |in |a |data |set, |to |
summarize |the |information |revealed |in |a |data |set, |and |to |present |the |information |in |a |convenient |
form
Inferential |Statistics |- |verified |answersUtilizes |sample |data |to |make |estimates, |decisions, |predictions, |
or |other |generalizations |about |a |population
Population |- |verified |answersThe |entire |body |of |observations |e.g. |people, |objects, |transactions, |or |
events |that |were |interested |in |studying
Example: |ALL |students |taking |Stat |201 |during |winter |session
Sample |- |verified |answersSubset |of |a |population
Variable |- |verified |answersCharacteristic |or |property |of |an |individual |element |of |a |population |to |be |
measured |or |observed |
Example: |Average |heights |of |students |at |UD |- |the |variable |is |heights
Qualitative |Data |- |verified |answers-Attribute |or |categorical
-A |variable |whose |characteristic |is |nonnumeric
-Can |only |be |organized |through |bar |graphs |and |pie |charts
-Example: |gender, |type |fo |car, |eye |color, |etc.
Quantitative |Data |- |verified |answers-Numerical
-Reported |numerically |
-Ex: |minutes |remaining |in |class, |number |of |children |in |a |family |
-Can |be |described |a |discrete |or |continuous
-Can |only |be |organized |through |histograms, |stem-and-leaf |plots, |dot |plots, |and |box |plots
Discrete |Variables |- |verified |answers-Can |only |assume |certain |values, |usually |"gaps" |between |values
, -Example: |Number |of |chairs |in |a |room, |number |of |people |in |a |class, |number |of |tickets |sold |at |the |
movies
Continuous |Variables |- |verified |answers-Can |assume |ANY |value |within |a |specified |range |or |interval
-Example: |pressure |in |a |tire, |the |weight |of |a |pork |chop, |the |heigh |of |students |in |a |class
Sources |of |data |- |verified |answers-Published |data
-Data |obtained |from |an |experiment
-Data |obtained |from |a |survey
-Data |obtained |from |an |observational |study
What |is |the |difference |between |a |Bar |Graph |and |a |Histogram? |- |verified |answersIn |a |bar |graph, |the |
bars |DO |NOT |touch |- |also |histograms |are |for |quantitative |data |and |bar |graphs |are |for |qualitative |data
Pareto |Graph |- |verified |answersA |bar |graph |with |the |categories |of |the |qualitative |(bars) |variables |
arranged |by |heigh |in |ascending |or |descending |order
-The |goal |is |that |it |is |easy |to |locate |the |"most |important" |categories |- |those |with |the |largest |
frequencies
Class |Frequency |- |verified |answersThe |number |of |observations |in |a |data |set |that |fall |into |each |set
Class |Relative |Frequency |- |verified |answersThe |proportion |of |the |total |number |of |observations |falling |
into |each |class |(each |frequency |divided |by |the |total)
Class |Percentage |- |verified |answersThe |class |relative |frequency |multiplied |by |100
Symmetric |Distribution |- |verified |answers-Mode |= |median |= |mean
-Zero |Skewness
-Mound |Shaped
Right |Skewed |Distribution |- |verified |answers-Positively |skewed: |the |mean |and |median |are |to |the |right
|of |the |mode
- |Mean |is |GREATER |than |the |median
- |Mean |> |Median |> |Mode
-Tail |to |the |right
Left |Skewed |Distribution |- |verified |answers-Negatively |skewed: |the |mean |and |the |median |are |to |the |
left |of |the |mode
-Mode |> |Median |> |Mean
-Mean |is |LESS |than |the |median |
-Tail |to |the |left
