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DATA COLLECTION - Coggle Diagram

- - - - Nominal
      - Ordinal (arranging)
    - - Continuous
      - Discrete
- - - - STRATIFIED (non overlapping groups)
      - CLUSTER (divided in cluster)
      - SIMPLE RANDOM (everyone)
      - SYSTEMATIC (find k=N/n) [no complete list of population]
- - - - CONVENIENCE (accesible units)
      - PURPOSIVE JUDGMENTAL
      - QUOTA
      - SNOWBALL