Statistics Chapter 3

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Author:
damea134
ID:
280036
Filename:
Statistics Chapter 3
Updated:
2015-08-05 22:00:34
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Histograms
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Description:
Histogram
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  1. What is a historgram
    graph that summarizes data
  2. Distribution Table
    Show the percentage distribution between class intervals. 
  3. Endpoints 
    0-1000 the Class from 0 to 1000 is included anything over a 1000 is placed in the next interval. 
  4.  Plotting Percentages
    Be sure to divide intervals by the percentages

    • Example
    • 0-1000          10%
    • 1000-2000     10%
    • 2000-3000     7%
    • 3000-5000     15% (Divide 15% x 2 intervals, which will equal 7.5%) 
    • 7000-10000   15%  (Divide 15% x 3 intervals, which will equal 5%) 
  5. Height of a Block
    To figure out the height of a block over a class interval, divide the percentage by the length of the interval

    • example:
    • 7000-1000 = 15% () = Height of 5%
  6. Area of Histogram Block
    The area of a block is always going to be () or  (for triangles)

    • Length = Intervals
    • Height = Usually Percentage

    example:

    Interval = 7000-10000  Height = 15% (for total area)

    area = 15 % X 3 intervals (7k-10k) = 45% area
  7. Variables 
    • Qualitative
    • Quantitative 
  8. Qualitative 
    • Single 
    • Marital Status
    • Widowed
    • Divorced
    • Separated

    NOT DISCRETE OR CONTINUIOUS
  9. Quantitative
    • Age
    • Family Size
    • Family Income
    • Height
    • Weight

    BOTH ARE DISCRETE AND CONTINUOUS
  10. Discrete
    The value can only vary by fixed amounts

    0,1,2,3 and so on nothing can be in the middle.

    Example of this would be a family size. 
  11. Continuous
    Values lie in between variables.

    Example of this would be age and weight. The difference are minute. In age a person can be a minute, hour, day, week month, or year older than another subject.
  12. The Density Scale
    Represents crowing of blocks within a histogram
  13. Cross Tabulation
    Different Groups (Tabs) are made and compared

    i.e. User and non-user.
  14. Selective Breeding
    Selecting Breeding consist of breeding certain people or mice based on favorable characteristics  

    I.e. Intellegence, Physical ability... 

    pg. 48

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