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Unit 3 - Coggle Diagram

- - - - levels: categories
  - - - Removes confounding variables (vars that doesn't cause something to happen but influences the result)
    - - Reduces variability of response variable
    - - Reduces effects of other variables
    - - Balances results that happened by chance
- - - - Sampling
        
        Survey
      - Retrospective (from the past)
      - Prospective (in the future)
- - - - Strata: condition, grouping info
      - Each member in each group should have an equal chance of being selected e.g.: parent sizes of 100:60 should have chances 10:6
  - - - Use (...) to generate random numbers describe how
        
        Ignore the numbers if it's drawn
        
        Select the corresponding data
        
        Stop when n data has been selected