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ST8 - IAI question paper 05/2015

Discussion in 'SP8' started by din sha, Nov 3, 2019.

  1. din sha

    din sha Member

    Q8. Part I
    I got confused on seeing the question based on buhlman straub credibility theory.
    I am unable to link it with clarity, how this question refers to buhlman straub credibility model. Could some one help - why E(var(theta)) is taken as 0.2 whereas var(Xi) used to derive other value ? Apologies for inconvenience , here is original question and solution.
     

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    Last edited by a moderator: Nov 8, 2019
    din sha, Nov 3, 2019
    #1
  2. din sha

    din sha Member

    Q8. Part I
    I got confused on seeing the question based on buhlman straub credibility theory.
    I am unable to link it with clarity, how this question refers to buhlman straub credibility model. Could some one help - why E(var(theta)) is taken as 0.2 whereas var(Xi) used to derive other value ?
    This is my first post and I don't know how to add attachments while in edit mode. Please see attached solution and original question Screenshot_20191108-105337~2.png Screenshot_20191108-104939~2.png tion
     
    din sha, Nov 8, 2019
    #2
  3. Katherine Young

    Katherine Young ActEd Tutor Staff Member

    Hi Din Sha,
    You're told to do this in the question: "Find estimates for E(Var(theta)) and Var(mu(theta)) based on the sample mean and sample variance from the sample data." So E(var(theta)) = sample mean = 0.2, and Var(mu(theta)) = sample variance = 0.25.

    Don't worry, this looks nothing like the Buhlmann Straub model. In fact I think the whole question is very odd. I think this must be a mistake on the examiners' part.
     
    Katherine Young, Nov 18, 2019
    #3
  4. din sha

    din sha Member

    Thanks Katherine,
    I am unable to understand if - "So E(var(theta)) = sample mean = 0.2, andVar(mu(theta)) = sample variance = 0.25". Then why in the solution it's trying to get sample variance.
     
    din sha, Nov 20, 2019
    #4
  5. Katherine Young

    Katherine Young ActEd Tutor Staff Member

    Honestly Din Sha, there's no point trying to understand the solution here. The whole question looks very wrong.
     
    Katherine Young, Nov 20, 2019
    #5

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