1. 

   Shikha Agarwal Member

   In ques 4.25, part(ii)
   
   Why
   Var(Yi)=Var(ei)?
   Why hadn't we considered var(Bxi)?

    

   Shikha Agarwal, Sep 2, 2016

   #1
2. 

   John Lee ActEd Tutor Staff Member

   Because \(\beta x_i\) is a constant.

    

   John Lee, Sep 7, 2016

   #2
3. 

   Bharti Singla Senior Member

   Is Xi not a variable here? Since it is bivariate data with variables x and y. Then how ßxi can be constant?

    

   Bharti Singla, Sep 7, 2016

   #3
4. 

   John Lee ActEd Tutor Staff Member

   Look at the model given on page 24 of the Tables, \(Y_i \sim N(\alpha + \beta x_i , \sigma ^2)\).
   
   The x is lower case whereas the Y is upper case.

    

   John Lee, Sep 9, 2016

   #4

   Bharti Singla likes this.
5. 

   Bharti Singla Senior Member

   oh okk. Thankyou

    

   Bharti Singla, Sep 9, 2016

   #5

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