Introductory Mathematics for Engineering Applications
1st Edition
ISBN: 9781118141809
Author: Nathan Klingbeil
Publisher: WILEY
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Chapter 2, Problem 10P
Repeat problem P2-9 if
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Students have asked these similar questions
Module Code: MATH380202
3. (a) Let {} be a white noise process with variance σ2.
Define an ARMA(p,q) process {X} in terms of {+} and state (without proof)
conditions for {X} to be (i) weakly stationary and (ii) invertible.
Define what is meant by an ARIMA (p, d, q) process. Let {Y} be such an ARIMA(p, d, q)
process and show how it can also be represented as an ARMA process, giving the
AR and MA orders of this representation.
(b) The following tables show the first nine sample autocorrelations and partial auto-
correlations of X and Y₁ = VX+ for a series of n = 1095 observations. (Notice
that the notation in this part has no relationship with the notation in part (a) of
this question.)
Identify a model for this time series and obtain preliminary estimates for the pa-
rameters of your model.
X₁
= 15.51, s² = 317.43.
k
1
2
3
4
5
6
7
Pk
0.981
0.974
0.968
akk 0.981 0.327
8
9
0.927
0.963 0.957 0.951 0.943 0.935
0.121 0.104 0.000 0.014 -0.067 -0.068 -0.012
Y₁ = VX : y = 0.03, s² = 11.48.
k
1…
Let G be a graph with n ≥ 2 vertices x1, x2, . . . , xn, and let A be the adjacency matrixof G. Prove that if G is connected, then every entry in the matrix A^n−1 + A^nis positive.
Module Code: MATH380202
1. (a) Define the terms "strongly stationary" and "weakly stationary".
Let {X} be a stochastic process defined for all t € Z. Assuming that {X+} is
weakly stationary, define the autocorrelation function (acf) Pk, for lag k.
What conditions must a process {X+) satisfy for it to be white noise?
(b) Let N(0, 1) for t€ Z, with the {+} being mutually independent. Which of
the following processes {X+} are weakly stationary for t> 0? Briefly justify your
answers.
i. Xt for all > 0.
ii. Xo~N(0,) and X₁ = 2X+-1+ &t for t > 0.
(c) Provide an expression for estimating the autocovariance function for a sample
X1,..., X believed to be from a weakly stationary process. How is the autocor-
relation function Pk then estimated, and a correlogram (or acf plot) constructed?
(d) Consider the weakly stationary stochastic process ✗+ = + + +-1+ +-2 where
{E} is a white noise process with variance 1. Compute the population autocorre-
lation function Pk for all k = 0, 1, ....
Chapter 2 Solutions
Introductory Mathematics for Engineering Applications
Ch. 2 - An analysis of a circuit shown in Fig. P2.1 yields...Ch. 2 - Repeat problem P2-I for the circuit shown in Fig....Ch. 2 - Repeat problem P2-I for the circuit shown in Fig....Ch. 2 - The current flowing through the inductor shown in...Ch. 2 - The voltage across the capacitor shown in Fig....Ch. 2 - In the purely resistive circuit shown in Fig....Ch. 2 - Repeat problem P2-6 if R=1600 and R2=R1+500.Ch. 2 - The energy dissipated by a resistor shown in...Ch. 2 - The equivalent capacitance C of two capacitors...Ch. 2 - Repeat problem P2-9 if C=75F and C2=C1+200F
Ch. 2 - The equivalent capacitance C of three capacitors...Ch. 2 - The equivalent inductance L of three inductors...Ch. 2 - Repeat problem R2-12 if L=150 mH and L1=L2+400 mH.Ch. 2 - The equivalent inductance L of three inductors...Ch. 2 - A model rocket is launched in the vertical plane...Ch. 2 - The ball shown in Fig. P2.16 is dropped from a...Ch. 2 - At time t=0, a hail is thrown vertically from the...Ch. 2 - To springs connected in series shown in Fig. P2.18...Ch. 2 - The equivalent stiffness of a series-parallel...Ch. 2 - An assembly of three springs connected in series...Ch. 2 - Consider a capacitor C and an inductor L connected...Ch. 2 - Assume that the total reactance in problem P2-21...Ch. 2 - If L=0.5 H. C=0.005 F, and the total reactance in...Ch. 2 - When converting resistances connected in a ∆...Ch. 2 - When converting resistances connected in a...Ch. 2 - When converting resistances connected in a ∆...Ch. 2 - When converting resistances connected in a...Ch. 2 - The characteristic equation of a series RLC...Ch. 2 - The characteristic equation of a parallel RLC...Ch. 2 - The characteristic equation of a mass, spring, and...Ch. 2 - The perimeter of an rectangle shown in Fig. P2.31...Ch. 2 - A diver jumps off a diving board 2.0 m above the...Ch. 2 - A level pipeline is required to pass through a...Ch. 2 - A research group is using a drop test to measure...Ch. 2 - The modulus of elasticity (E ) is a measure of a...Ch. 2 - Consider the following reaction having an...Ch. 2 - Consider the following reaction having an...Ch. 2 - An engineering co-op wants to hire an asphalt...Ch. 2 - Repeat problem P2-38 if the total area of the new...Ch. 2 - A city wants to hire a contractor to build a...
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