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Research Overview, The concept behind the topic you are researching. IE,…

- - - - Variables are ranked and are mutally exclusive
    - - Variables are seperated by distance and it often in numaric form,
      - Example: IQ between 90-120
    - - Variables that are seperated by distance and have a true zero point
    - - Variables whose characteristics are exhausive and mutually exclusive
- - - - Types of Error
        
        Systematic Error: Constistantly incorrect measurements
        
        Random: Random incorrect measurements
  - - - Are you measuring what you intend to
    - - How close each measurement is to each other
    - - Are the measurements used consitantly applied
- - - - Documents such as police reports, arrest data, ect