Chapter 10 Exam Type Question

Discussion in 'CT3' started by ldr, May 16, 2018.

  1. ldr

    ldr Member

    Hello

    I’m having difficulty of understanding the concept of the XMAX XMIN question on chapter 10 page 33 of CT3.

    I sort of understand the concept of XMAX and how is is essentially F(x) and because their are n in the sample then distribution function is F(x)^n

    For XMIN in the solution sections it explains how it is the opposite of XMAx so (1-F(X))^n I just don’t understand why it then becomes 1-(1-F(X))^n. The 1- at the beginning confuses me

    Any help understanding this concept will be hugely appreciated

    Thanks
     
  2. John Lee

    John Lee ActEd Tutor Staff Member

    (1-F(X))^n gives [P(X>x)]^n = P(Xmin > X)

    But we want the CDF of Xmin, hence we want P(Xmin <x) and thus we need the 1-
     

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