1. 

   Aisha Member

   In Q&A bank part 2, for the solution of question 2.6 (Iii), how is variance of ( x (bar) | theta ) = (1/n) * var( Xj| theta)

    

   Aisha, Sep 10, 2017

   #1
2. 

   John Lee ActEd Tutor Staff Member

   \(var(\bar X) = var(\sum X_j /n) = \frac{1}{n^2} \sum var(X_j) \) since independent
   \(=\frac{1}{n^2} n var(X_j)\) since identical

    

   John Lee, Sep 21, 2017

   #2

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