2. Let f(x,y) = e-r-u, 0 < x < oo, 0 < y < oo, zero elsewhere, be the pdf of X and Y. Then if Z = X + Y, compute (a) P(Z 0). (b) P(Z 6) (c) P(Z 2) (d) What is the pdf of Z?
4 Suppose f : (0,0) → (0,x), is a differentiable function satisfying f(a +b)-f(a)fb), for all a,b>0 Moreover, assume that f(0)1 (a) Prove that there exists λ (not necessarily positive) such that f(r) = e-Ar, for all r. Hint Find and solve a proper differential equation. (b) Suppose that X is a continuous random variable, with P(X>ab)-P(>a)P(X> b), for all a, b e (0, oo). Prove that X is exponentially distributed
EXAMPLE 3 Sketch the graph of x) = 5xe". (A) The domain of f is R. (B) The x- and y-intercepts are both (C) Symmetry: None. (D) Because both 5x and ex become large as x →oo, we have limx→”5xex=00, As x →-oo, however, ex→ and so we have an indeterminate product that requires the use of l'Hospital's Rule: 5xlim Video Example Thus the x-axis is a horizontal asymptote (E) f(x) = 5xex + 5e" = Since ex is always...
Suppose that f is integrable on (a, b) and define (f(x) if f(x) > 0 f+(x) = 3 and f (2)= if f(x) < 0, Show that f+ and f- are integrable on (a, b), and If(x) if f(x) > 0, if f(x) < 0. cb Sisleyde = [* p*(e) ds + [°r(a)di. | f(x) dx = | f+(x) dx + 1 f (x) dx.
eE7B2(a) Normalize (to 1) the wavefunction e-ax2 ǐn the range-oo a >0. Refer to the Resource section for the necessary integral. X oo, with
Suppose f is continuous, f(0)=0, f(2)=2, f'(x)>0 and f (x) dx = 1. Find the value of the integral fro f-?(x) dx =?
7. Consider the function f:R + R defined by f(x) = x < 0, 3 > 0. e-1/x2, Prove that f is differentiable of all orders and that f(n)(0) = 0 for all n e N. Conclude that f does not have a convergent power series expansion En Anx" for x near the origin. [We will see later in this class that this is impossible for holomorphic functions, namely being (complex) differentiable implies that there is always a convergent power...
3] Let f : (0, oo) + R be differentiable on (0,0o). Define the difference function (af)(z) := f(z + 1)-f(x), x > 0. If linnof,(z-0, find linn (Sf)(x).
A (3 pt) Let Xi, ,X, are drawn from the distribution ftheta(z) = F 404 (r+0) , for 0 < x < oo and 0 < θ < oo. We define Y = 3X an estimator for θ. Verify whether this estimator is unbiased? Find the MSE of Y. Hint: E(x)E(X B (3 pt) Let X,.., X, are drawn from the distribution fo) for O < x < 00 and 0 < θ < oo. We define Y = 2X...
-xoe x Bar (6) x >0x>0, B > 0 Homework If x ~ Gamma (2,3) Find E(X ) - E (x4) - Elx"), K is a positive © E (x ) integar Xmf(x) dx can M, Variance: 82 2012 Ean : M Standard deviation - o 1 - 2