Q 6.3. Let X = (X1, X2,..., Xn) be a random vector with mean vector μ and variance- covariance matrix E. Suppose that for every a = (a1, a2,..., an) € R", the random variable a X has a (one-dimensional) Gaussian distribution on R. (a) For fixed a € R", compute the moment generating function Marx(u) of the random variable a X writing the answer using and Σ. (b) Define Mx (t₁, t2, ..., tn), the moment generating function of the random vector X, and ex- press it in terms of Merx the moment generating function of tT X where t = (t₁, t2,..., tn). (c) Combining (a) and (b), compute the moment generating function Mx (t) of X and hence prove that the random vector X has a Gaussian distribution.
Q 6.3. Let X = (X1, X2,..., Xn) be a random vector with mean vector μ and variance- covariance matrix E. Suppose that for every a = (a1, a2,..., an) € R", the random variable a X has a (one-dimensional) Gaussian distribution on R. (a) For fixed a € R", compute the moment generating function Marx(u) of the random variable a X writing the answer using and Σ. (b) Define Mx (t₁, t2, ..., tn), the moment generating function of the random vector X, and ex- press it in terms of Merx the moment generating function of tT X where t = (t₁, t2,..., tn). (c) Combining (a) and (b), compute the moment generating function Mx (t) of X and hence prove that the random vector X has a Gaussian distribution.
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Step 1: Write the given information.
VIEWStep 2: Compute the moment generating function Ma^TX(u) of the random variable a^TX.
VIEWStep 3: Define Mx(t1, t2, ..., tn), the moment generating function of the random vector X
VIEWStep 4: Compute the moment generating function MX(t) of X combining (a) and (b).
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