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Chapter 23 - Coggle Diagram

- - - - Used when data is grouped into small subgroups (< 8 typically)
      - Tracks average (mean) and range (spread)
      - Best for frequent sampling and stable subgroup sizes
    - - Used when subgroup size is larger (> 8)
      - Tracks mean and standard deviation
      - Preferred when variability needs more precise measurement
    - - Used when subgrouping is not possible
      - Tracks individual values and variation between points
      - Ideal for slow processes or limited data collection