I be a 4-dimensional random vector defined as X = = ation matrix E[X] = at V 0 0 be a 3-dimensional random vector with Rx = X₁ X₂ 1 -1 0 0 Y₁ = X₁ - X2, Y2=X2- X3, Y3 = X3 - X4. -1 0

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.7: Applications
Problem 14EQ
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Let X be a 4-dimensional random vector defined as X =
correlation matrix
E[X]
=
0
0
0
0
Let Y be a 3-dimensional random vector with
Rx =
[X₁ X2 X3 X4]' with expected value vector and
1
0
0
Y₁ = X₁ - X2,
Y₂=X2- X3,
Y3 = X3 X4.
-1
7
1
-1
0
0
-1
1
(a) Find a matrix A such that Y = AX.
(b) Find the correlation matrix of Y, that is Ry.
(c) Find the correlation matrix between X₁ and Y, that is Rx₁Y.
0
0
-1
1
Transcribed Image Text:Let X be a 4-dimensional random vector defined as X = correlation matrix E[X] = 0 0 0 0 Let Y be a 3-dimensional random vector with Rx = [X₁ X2 X3 X4]' with expected value vector and 1 0 0 Y₁ = X₁ - X2, Y₂=X2- X3, Y3 = X3 X4. -1 7 1 -1 0 0 -1 1 (a) Find a matrix A such that Y = AX. (b) Find the correlation matrix of Y, that is Ry. (c) Find the correlation matrix between X₁ and Y, that is Rx₁Y. 0 0 -1 1
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