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.

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Q 6.3. Let X = (X₁, X2,..., Xn)T be a random vector with mean vector µ and variance-
covariance matrix E. Suppose that for every a =
(a1, a2,...,
,an)TE R¹, 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 Mtrx the moment generating function of t¹ X where t
=
(t₁, t2,. , tn).
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.
Transcribed Image Text:Q 6.3. Let X = (X₁, X2,..., Xn)T be a random vector with mean vector µ and variance- covariance matrix E. Suppose that for every a = (a1, a2,..., ,an)TE R¹, 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 Mtrx the moment generating function of t¹ X where t = (t₁, t2,. , tn). 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.
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