A Transition to Advanced Mathematics
8th Edition
ISBN: 9781285463261
Author: Douglas Smith, Maurice Eggen, Richard St. Andre
Publisher: Cengage Learning
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Textbook Question
Chapter 5.1, Problem 5E
Give an example of an algebraic structure of order 4 that has both right and left cancellation but that is not a group.
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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 5 Solutions
A Transition to Advanced Mathematics
Ch. 5.1 - The Cayley tables for operations o,*,+, and are...Ch. 5.1 - Prob. 2ECh. 5.1 - Prob. 3ECh. 5.1 - Prob. 4ECh. 5.1 - Give an example of an algebraic structure of order...Ch. 5.1 - Prob. 6ECh. 5.1 - Show that the structure ({1},), with operation ...Ch. 5.1 - (a)In the group G of Exercise 2, find x such that...Ch. 5.1 - Show that (,), with operation # defined by...Ch. 5.1 - Construct the operation table for each of the...
Ch. 5.1 - Prob. 11ECh. 5.1 - (a)Prove that (m,+) is associative and commutative...Ch. 5.1 - Suppose m and m2. Prove that 1 and m1 are distinct...Ch. 5.1 - Let m and a be natural numbers with am. Complete...Ch. 5.1 - Prob. 15ECh. 5.1 - Prob. 16ECh. 5.1 - Prob. 17ECh. 5.1 - Consider the set A={a,b,c,d} with operation ogiven...Ch. 5.1 - Repeat Exercise 2 with the operation * given by...Ch. 5.1 - Let m,n and M=A:A is an mn matrix with real number...Ch. 5.1 - Prob. 21ECh. 5.1 - Prob. 22ECh. 5.2 - Show that each of the following algebraic...Ch. 5.2 - Given that G={e,u,v,w} is a group of order 4 with...Ch. 5.2 - Prob. 3ECh. 5.2 - Give an example of an algebraic system (G,o) that...Ch. 5.2 - Construct the operation table for S2. Is S2...Ch. 5.2 - Prob. 6ECh. 5.2 - Let G be a group and aiG for all n. Prove that...Ch. 5.2 - Prove part (d) of Theorem 6.2.3. That is, prove...Ch. 5.2 - Prob. 9ECh. 5.2 - Prob. 10ECh. 5.2 - Prob. 11ECh. 5.2 - Assign a grade of A (correct), C (partially...Ch. 5.3 - Assign a grade of A (correct), C (partially...Ch. 5.3 - Find all subgroups of (8,+). (U11,). (5,+). (U7,)....Ch. 5.3 - In the group S4, find two different subgroups that...Ch. 5.3 - Prove that if G is a group and H is a subgroup of...Ch. 5.3 - Prove that if H and K are subgroups of a group G,...Ch. 5.3 - Let G be a group and H be a subgroup of G. If H is...Ch. 5.3 - Prob. 7ECh. 5.3 - Prob. 8ECh. 5.3 - Prob. 9ECh. 5.3 - List all generators of each cyclic group in...Ch. 5.3 - Prob. 11ECh. 5.3 - Let G be a group, and let H be a subgroup of G....Ch. 5.3 - Let ({0},) be the group of nonzero complex numbers...Ch. 5.3 - Prob. 14ECh. 5.3 - Prob. 15ECh. 5.3 - Let G=a be a cyclic group of order 30. What is the...Ch. 5.4 - Is S3 isomorphic to (6,+)? Explain.Ch. 5.4 - Prob. 2ECh. 5.4 - Use the method of proof of Cayley's Theorem to...Ch. 5.4 - Define f:++ by f(x)=x where + is the set of all...Ch. 5.4 - Assign a grade of A (correct), C (partially...Ch. 5.4 - Prob. 6ECh. 5.4 - Define on by setting (a,b)(c,d)=(acbd,ad+bc)....Ch. 5.4 - Let f the set of all real-valued integrable...Ch. 5.4 - Prob. 9ECh. 5.4 - Find the order of each element of the group S3....Ch. 5.4 - Prob. 11ECh. 5.4 - Let (3,+) and (6,+) be the groups in Exercise 10,...Ch. 5.4 - Prob. 13ECh. 5.4 - Prob. 14ECh. 5.4 - Prob. 15ECh. 5.4 - Prob. 16ECh. 5.4 - Prob. 17ECh. 5.5 - Prob. 1ECh. 5.5 - Prob. 2ECh. 5.5 - Show that any two groups of order 2 are...Ch. 5.5 - Show that the function h: defined by h(x)=3x is...Ch. 5.5 - Let R be the equivalence relation on ({0}) given...Ch. 5.5 - Prob. 6ECh. 5.5 - Prob. 7ECh. 5.5 - Let (R,+,) be an algebraic structure such that...Ch. 5.5 - Assign a grade of A (correct), C (partially...Ch. 5.5 - Let M be the set of all 22 matrices with real...
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