1. Let z,t = 1,...,n, be scalar random variables with Cov(zt, zs) = 0 for ts. Show that Var(-1)=E=1 Var(t). 2. Let b be a k x 1 random vector. Show that Var(b) is (i) symmetric and (ii) positive semidefinite. 3. Let A be an invertible square matrix. Show that (A)-1 = (A-¹). (Hint: It suffices to show that A'(A-¹)=

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Related Book For  answer-question

Applied Linear Algebra

1st edition

Authors: Peter J. Olver, Cheri Shakiban

ISBN: 978-0131473829