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G(n)=bx (lnb)n So bx = X1 n=0 g(n)(0) n!(e) the variance of Y 4 Let Y be a random variable having mean µ and suppose that E(Y −µ)4 ≤ 2 Use this information to determine a good upper bound to P(Y −µ ≥ 10) 5 Let U and V be independent random variables, each uniformly distributed on 0,1 Set X = U V and Y = U − V Determine whether or not X and Y areG & ¯ L }7 è à Æ ¹ ñ µ ñ ® £ Ö ¢ s?
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E(Y) = E E(YjX) = Z E(YjX= x)p X(x)dx The Law of Total Variance is Var(Y) = Var E(YjX) E Var(YjX) The moment generating function (mgf) is M X(t) = E etX If M X(t) = M Y(t) for all tin an interval around 0 then X =d Y The moment generating function can be used to \generate" all the moments of a distribution,Y n m Í o%3, Þ è s b q O d } j Ü ê µ r z I T y n m Í o ¦ " / g s b q O d } ¢ ñ Ç r z È ¢ ñ Ç < y T L r M Þ é ª Á Ï ® é Õ s y û Æ Â ê c q y n m È V b j è Ä é ¤ Ö y U q O d }1 ra ndom v ector with mean µ x and v aria nce co v ar iance ma trix !



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X ismultivariatenormal⇔ a′x isnormalforalla def'n x ∼ Np(µ,Σ) ⇔ a′x ∼ N(a′µ,a′p thm If x ∼ Np(µ,Σ) then its characteristic function is φx(t) = exp(it′µ− 1 2t ′Σt) Proof Let y = t′x Then the cf of y is φy(s) def= E{eisy} = exp{isE(y)−1 2s 2var(y)} = exp{ist′µ−1 2s 2t′Σt} Then the cf of x~ s k ¯ oB ñ S E ¥ T Å ' Í ¥% E p ¥( ' ^ B Õ V õ v" ñ $ ?



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Í Ç Ò Æ Å Î É?2 Note that approximation works better when n is large and p is small as can been seen in the following plot If p is relatively large, a difierent approximation should be used This is coming later (Note(x−µ)2 2 ˙ is the N(µ,1) density, and f 2(xµ,τ) = 1 √ 2πτ2 exp ˆ − (x−µ)2 2τ2 ˙ is the N(µ,τ2) density Then the expectation of a random variable with this mixture density is given by EX i = Z ∞ −∞ xf(xµ,τ2,p)dx = Z ∞ −∞ x pf 1(xµ)(1−p)f 2(xµ,τ2) dx



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^ q b ( n j y & Ú } t z Ö W à c k n j y V ö Ñ R d y v J Þ è V U Ü j v õ ¢ r / b j Q k } n q ¦ y 0 Ô À n à \ b % v ` n j ÿ b O Ñ / k n j } & Ú z µ \ \ t F ( Ï r & Ú µ O j y ° S q O } { O ° o ¨ ñ / r Î y Ø Á r(b) (7 points) Derive , the variance of U, in terms of b, and the covariance 2 σU 2, 2 σX σY σXY 2 σU = EU 2 − E(U)2 = EU2 because the second term is zero = E(Y − µ Y) 2 − 2b(X−µ x)(Y − µ Y) b 2(X−µ x) 2 = E(Y − µ Y) 2 − 2bE(X−µ x)(Y − µ Y) b 2E(X−µ x) 2 = 2 − 2b σY σXY b 2 2 σX (c) (6 points) Suppose I want to choose b in order toµ X = EX = Z ∞ −∞ xf X(x) dx The expected value of an arbitrary function of X, g(X), with respect to the PDF f X(x) is µ g(X) = Eg(X) = Z ∞ −∞ g(x)f X(x) dx The variance of a continuous rv Xwith PDF f X(x) and mean µ X gives a quantitative measure of how much spread or dispersion there is in the distribution of xvalues The



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2 EXY = EX EY 3 EAX = AEX for a constant matrix A 4 More generally (Seber & Lee Theorem 11) EAZBC = AEZB C if A,B,C are constant matrices Definition If X is a random vector, the covariance matrix of X is defined as cov(X) ≡ cov(Xi,Xj) ≡ var(X1) cov(X1,X2) ··cov(X1,) cov(X2,X1) var(X2) ··cov(X2,)32 6 Gaussian Random Vectors MZ(A)This establishes the result on the MGF of X, since MZ()= =1 exp( 2 /2) = exp( 1 2 2) for all ∈ R We say that X has the multivariate normal distribution with param eters µ and Σ= AA, and write this as X ∼ N(µAA) Theorem 2 X= (X1 X) has a multivariate normal distributionÖ Z b { > µ Q q w Q w ² Í ® h h ï ¯ ^ X ` h h z ® µ Ö h h ï x NN ¢ ° È £ p b { À 7 ¯ ï Í « Ä s ) ò Q 7 w Ñ é ï Ä a ¼ q w È í æ P ;



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