ct3 exam paper 2005 april question 12

Discussion in 'CT3' started by ldr, Jul 7, 2018.

  1. ldr

    ldr Member

    I'm confused over question 12 part iib)
    it asks us to find the CRLB which we do by differentiating the log differential. However in the examiners reports, when differentiating it doesn't seem to make use of the product rule?

    The log differential is
    upload_2018-7-7_12-19-50.png

    and then it says the differential of this is

    upload_2018-7-7_12-20-34.png

    I don't understand why the product rule or quotient rule hasn't been used?

    Could you please explain. Thank you!
     
    ldr, Jul 7, 2018
    #1
  2. Debbie Nal

    Debbie Nal Member

    Hi,

    They've actually shortened the process but I believe you will arrive at the same answer.
     
    Debbie Nal, Jul 16, 2018
    #2
    John Lee likes this.

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