1. 

   Janboyd Member

   Why doesn't the pooled variance formula work for calculating average sd for combined data?

    

   Janboyd, Sep 10, 2017

   #1
2. 

   John Lee ActEd Tutor Staff Member

   Because the formula assumes that samples come from a distribution with the same variance.

    

   John Lee, Sep 21, 2017

   #2

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