# assign05 - < p< 1 2 Let S n = Y 1 Â Â Â Y n denote...

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Stat 351 Fall 2007 Assignment #5 This assignment is due at the beginning of class on Friday, October 5, 2007. You must submit solutions to all problems. As indicated on the course outline, solutions will be graded for both content and clarity of exposition. The solutions that you submit must be neat and orderly. Do not crowd your work or write in multiple columns. Your assignment must be stapled and problem numbers clearly labelled. 1. Suppose that Y 1 ,Y 2 ,. .. are independent and identically distributed random variables with P { Y 1 = 1 } = p , P { Y 1 = - 1 } = 1 - p for some 0
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Unformatted text preview: < p < 1 / 2. Let S n = Y 1 + Â· Â· Â· + Y n denote their partial sums. (a) Show that X n = S n-n (2 p-1) is a martingale (b) Show that Z n = Â± 1-p p Â² S n is a martingale 2. Consider the following sequence X ,X 1 ,X 2 ,. .. of random variables. Suppose that p, q âˆˆ (0 , 1) and set X = p . Suppose further that the distribution of X n +1 depends only on X n by P ( X n +1 = (1-q ) X n | X n ) = 1-X n , P ( X n +1 = q + (1-q ) X n | X n ) = X n . Show that { X n , n = 0 , 1 ,. .. } is a martingale....
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## This note was uploaded on 03/26/2012 for the course STAT 351 taught by Professor Michaelkozdron during the Fall '08 term at University of Regina.

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