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- 1)A random vector z = (x y) T has joint probability density given by:a)Sketch the graph of the probability density function pxy(X, Y ).b)Determine the value of the constant C.c)Determine the mean mz vector.A system of random variables (X, Y) is normally distri- buted with the probability density ƒ(x, y) = 21/02 exp{-*² 2 +2 1². 20² Find the probability density of the system (R, D) if X = R cos , Y = R sin Þ.3. Suppose that X and Y are independent with X ~ N(0, 1) and Y~ N(0,4). Let U = X + Y and V = X - Y. a) Find the joint probability density function of (U, V), fu,v(u, v). b) Are U and V independent?
- Consider a random variable Y with density S (1/2)(y + 1), -1 < y < 1, else. f(y) Calculate E(W) and V(W) for the random variable W = 4+Y – 2Y².b) Let Y1, Y2, ..., Yn be a random sample from a population with probability density function in part a). Show that the best test for the hypothesis in part a) rejects Ho if |yi <c i=1 where c solves the probability equation a = P(II1Yis c[0 = 2). c) Let X1,X2, ..., Xn be a random sample from GAMMA(2,ß) distribution, and consider Y = E-,Xi- Show whether or not Y is a pivotal quantity and give its distribution.Suppose that the random variables X, Y, Z have multivariate PDFfXYZ(x, y, z) = (x + y)e−z for 0 < x < 1, 0 < y < 1, and z > 0. FInd (d) fZ|XY (z|x,y), (e) fX|YZ(x|y, z).
- Suppose that the joint density function of two random variables W₁ and W₂ is given by F (w₁, W₂) = {C(W₁ + w?), 0, 03. Let random variables X and Y be independent with joint density fe(x, y). Let Ix (0) and Iy (0) be the Fisher information of X and Y, respectively. Prove that the Fisher information I(x,y)(0) = Ix(0) + Iy(0).a) Write down an expression for the probability density, ρ(t, x), in terms of the wavefunction of a particle, Ψ(t, x). b) Write down expressions for the momentum and energy operators, pˆ and Hˆ , for a particle in one dimension. c) Write down expressions for the expectation values of momentum and energy, ⟨p⟩ and ⟨E⟩, for the wavefunction Ψ(t, x). d) Write down an expression for the uncertainty in momentum, ∆p, in terms of the relevant expectation values.