1. Show, by using characteristic, or moment generating functions, that if fx(x) = ½ex, -∞0 < x < ∞, then XY₁ - Y2, where Y₁ and Y2 are independent, exponentially distributed random variables.
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- Repeat Example 5 when microphone A receives the sound 4 seconds before microphone B.(d) Suppose that new copies cost $150 and used copies cost $80. Assume the bookstore currently has 50 new copies and 50 used copies. What is the expected value of total revenue from the sale of the next 15 copies purchased? [Hint: Let h(X) = the revenue when X of the 15 purchasers want new copies. Express this as a linear function.] $The functions i)= e **2f,(x) = e*-3 %3D are O A. Insufficient information to conclude None of them O B. O C. Neither linearly dependent or independent OD. Linearly independent O E. Linearly dependent
- Let y represent the annual income of an individual in 2018. Let z represent the number of days the individual worked in 2018. Let x represent the number of days the individual spent snow skiing in 2018. Let w represent the number of days the individual did not work in 2018. Which of the following models violate A3 (MLR.3)? O y = Bo+B1 + 2 + O y = Bo + B₁x + B₂z+u O y = Bo + Bi +B2 z tu All of the above.need help with all parts? but esp d).Q2.1 have been given the following sets functions. Which of are linearly you them on the interval of (-∞0, ∞0) ? one right answer. more than independent There may be Leption f₁ (x) = x²₂ f₁₂ (x) = 3x²₂ f₂(x) = x² +6 option 2 f₁cx) = 3e³x₂f₂(x) = 9e⁹x - f₁₂(x) = 276²7x option 3 2 f₁(x) = 2sin ²³ x ₂ f₂(x) = 6 cos ²³ x 9 f₂(x)=x of
- 2. A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X = the proportion of time that the drive-up facility is in use (at least one customer is being served or waiting to be served) and Y = the proportion of the time that the walk-up window is in use. Then the set of possible values for (X, Y) is the rectangle D = {(x, y): 0 ≤ x ≤ 1,0 ≤ y ≤ 1}. Suppose the joint probability density function of (X, Y) is given by: fx,y(x,y) = { / (x + y ² ) ²²(x + y²) 0≤x≤ 1,0 ≤ y ≤ 1 Otherwise 0 (a) Show that fx,y is legitimate (b) Find the probability that neither facility is busy more than one-quarter of the time. (c) Find fx and fy, the marginal probability density function of X and Y respectively. (d) Construct the conditional probability density function of Y given that X=0.8. (e) Evaluate the probability that the walk-up facility is busy at most half of the time given that X=0.8 (f) Calculate the expected proportion of the time that the walk-up facility…The Phillips curve describing an economy takes the form u = un – α(π – Eπ). The central bank directly sets the inflation rate to minimize the following loss function, L (u, π) = u + γπ2. The symbol u denotes the unemployment rates, un is the natural rate of unemployment, π is the inflation rate, Eπ is the expected inflation rate, and α and γ are behavioral response parameters of the economy. Private agents form their expectations rationally before the central bank sets the inflation rate. The optimal inflation rate when the central bank operates using a fixed rule will be _____. The optimal inflation rate when the central bank operates with discretion will be _____. a. un; 0 b. 0; un c. 0; α/(2γ) d. α/(2γ); 0Time management is often a difficult task. Usually Tim studies m hours per week. In this term, he has n courses and course i € {1,...,n} requires at minimum ki hours (e.g. going to classes, discussions). Assume there is a family of linear functions f(x) = aix+b; with ai [0, ∞) and b; ER, which estimate the expected score of the course i if Tim studies 2 hours per week for that course. How can Tim allocate his time per week so that he can achieve the maximum expected average score of the whole term? Write a linear program that solves this problem.
- 3.4. Show that if f and g are pdfs and a € [0, 1], then af+(1-a)g is also a pdf.The following table shows the hot dogs bought from a street vendor over the course of eight days ("Demand"). Also shown is the temperature for each day in degrees Celsius. Temperature (°C) 21 13 22 19 5 13 16 23 Demand 45 30 34 42 16 21 40 35 y=10.99+1.33x The predicted demand for hot dogs on a day with a temperature of 15°C is (Round to the nearest integer as needed.)2. Let preferences of both individuals be given by log(c) + log(c). Suppose that the endowment vectors are wA = (5, 10) and wB clearing price and the equilibrium consumption bundles of each individual. (10, 5). Solve for the market

