Contemporary Mathematics for Business & Consumers
8th Edition
ISBN: 9781305886803
Author: Brechner
Publisher: Cengage
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Chapter 6.III, Problem 17RE
At Camper’s Paradise, sales have increased 15%, 20%, and 10% over the past three years; that is, 15% three years ago, 20% two years ago, and 10% one year ago. If sales this year are $1,000,000, how much were sales three years ago? Round each year’s sales to the nearest dollar.
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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 6 Solutions
Contemporary Mathematics for Business & Consumers
Ch. 6.I - Convert the following percents to decimals. a. 27%...Ch. 6.I - Convert the following decimals or whole numbers to...Ch. 6.I - Prob. 3TIECh. 6.I - Prob. 4TIECh. 6.I - Convert the following percents to decimals.
1.
Ch. 6.I - Prob. 2RECh. 6.I - Prob. 3RECh. 6.I - Prob. 4RECh. 6.I - Prob. 5RECh. 6.I - Prob. 6RE
Ch. 6.I - Prob. 7RECh. 6.I - Prob. 8RECh. 6.I - Prob. 9RECh. 6.I - Convert the following percents to decimals.
10....Ch. 6.I - Prob. 11RECh. 6.I - Prob. 12RECh. 6.I - Prob. 13RECh. 6.I - Prob. 14RECh. 6.I - Prob. 15RECh. 6.I - Prob. 16RECh. 6.I - Prob. 17RECh. 6.I - Convert the following decimals or whole numbers to...Ch. 6.I - Prob. 19RECh. 6.I - Prob. 20RECh. 6.I - Prob. 21RECh. 6.I - Prob. 22RECh. 6.I - Prob. 23RECh. 6.I - Prob. 24RECh. 6.I - Prob. 25RECh. 6.I - Prob. 26RECh. 6.I - Prob. 27RECh. 6.I - Prob. 28RECh. 6.I - Prob. 29RECh. 6.I - Prob. 30RECh. 6.I - Prob. 31RECh. 6.I - Prob. 32RECh. 6.I - Prob. 33RECh. 6.I - Prob. 34RECh. 6.I - Prob. 35RECh. 6.I - Prob. 36RECh. 6.I - Prob. 37RECh. 6.I - Prob. 38RECh. 6.I - Prob. 39RECh. 6.I - Prob. 40RECh. 6.I - Prob. 41RECh. 6.I - Prob. 42RECh. 6.I - Prob. 43RECh. 6.I - Prob. 44RECh. 6.I - Prob. 45RECh. 6.I - 46. You have been asked to make a presentation...Ch. 6.II - Solve the following for the portion. What is the...Ch. 6.II - Prob. 6TIECh. 6.II - Solve the following for the portion.
a. Premier...Ch. 6.II - Prob. 8TIECh. 6.II - Prob. 9TIECh. 6.II - Prob. 10TIECh. 6.II - Prob. 11TIECh. 6.II - Prob. 12TIECh. 6.II - Solve the following for the base. Round to...Ch. 6.II - Prob. 1RECh. 6.II - Prob. 2RECh. 6.II - Prob. 3RECh. 6.II - Prob. 4RECh. 6.II - Solve the following for the portion. Round to...Ch. 6.II - Prob. 6RECh. 6.II - Prob. 7RECh. 6.II - Solve the following for the portion. Round to...Ch. 6.II - Prob. 9RECh. 6.II - Prob. 10RECh. 6.II - Prob. 11RECh. 6.II - Prob. 12RECh. 6.II - Prob. 13RECh. 6.II - 14. What is the rate if the base is 288 and the...Ch. 6.II - Solve the following for the rate. Round to the...Ch. 6.II - Solve the following for the rate. Round to the...Ch. 6.II - Prob. 17RECh. 6.II - Solve the following for the rate. Round to the...Ch. 6.II - Prob. 19RECh. 6.II - Solve the following for the rate. Round to the...Ch. 6.II - Prob. 21RECh. 6.II - Prob. 22RECh. 6.II - Prob. 23RECh. 6.II - Solve the following for the base. Round to...Ch. 6.II - Prob. 25RECh. 6.II - Solve the following for the base. Round to...Ch. 6.II - Prob. 27RECh. 6.II - Prob. 28RECh. 6.II - Prob. 29RECh. 6.II - Solve the following for the base. Round to...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Prob. 33RECh. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Prob. 36RECh. 6.II - Prob. 37RECh. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Prob. 43RECh. 6.II - Solve the following word problems for the portion,...Ch. 6.II - Use the pie chart "Century Mutual Fund -...Ch. 6.II - Use the pie chart "Century Mutual Fund -...Ch. 6.II - Prob. 47RECh. 6.II - Use the pie chart "Century Mutual Fund -...Ch. 6.II - 49. You are the catering manager for the Imperial...Ch. 6.III - Solve the following problem for the rate of...Ch. 6.III - Solve the following problem for the rate of...Ch. 6.III - Solve the following problem for the rate of...Ch. 6.III - Prob. 17TIECh. 6.III - Prob. 18TIECh. 6.III - Solve the following business situation for the new...Ch. 6.III - Solve the following business situation for the...Ch. 6.III - Solve the following business situation for the...Ch. 6.III - Prior to an election, a political research firm...Ch. 6.III - Solve the following increase or decrease problems...Ch. 6.III - Prob. 2RECh. 6.III - Solve the following increase or decrease problems...Ch. 6.III - Solve the following increase or decrease problems...Ch. 6.III - Prob. 5RECh. 6.III - Prob. 6RECh. 6.III - Prob. 7RECh. 6.III - Solve the following increase or decrease problems...Ch. 6.III - Prob. 9RECh. 6.III - Prob. 10RECh. 6.III - Over a two-month period, the number of weekly...Ch. 6.III - Sunshine Honda sold 112 cars this month. If that...Ch. 6.III - 13. At a Sports King store, 850 tennis racquets...Ch. 6.III - At a Safeway Supermarket, the price of yellow...Ch. 6.III - 15. According to the American Association of...Ch. 6.III - 16. Housing prices in Foster County have increased...Ch. 6.III - At Campers Paradise, sales have increased 15%,...Ch. 6.III - 18. According to the U.S. Census Bureau, in 1950,...Ch. 6.III - 19. After a vigorous promotion campaign. Crunchy...Ch. 6.III - 20. The chart “Chip Rivalry" illustrates the...Ch. 6.III - 21. Economic reports indicate that during a recent...Ch. 6 - 1. A percent is a way of expressing a part of).a...Ch. 6 - Prob. 2CRCh. 6 - 3. Percent means “parts per ______.” The percent...Ch. 6 - Prob. 4CRCh. 6 - Prob. 5CRCh. 6 - Prob. 6CRCh. 6 - Prob. 7CRCh. 6 - Prob. 8CRCh. 6 - Prob. 9CRCh. 6 - In the percentage formula, the___ is the variable...Ch. 6 - Prob. 11CRCh. 6 - Prob. 12CRCh. 6 - Prob. 13CRCh. 6 - Prob. 14CRCh. 6 - Prob. 1ATCh. 6 - Prob. 2ATCh. 6 - Prob. 3ATCh. 6 - Prob. 4ATCh. 6 - Prob. 5ATCh. 6 - Prob. 6ATCh. 6 - Prob. 7ATCh. 6 - Prob. 8ATCh. 6 - Prob. 9ATCh. 6 - Prob. 10ATCh. 6 - Prob. 11ATCh. 6 - Prob. 12ATCh. 6 - Prob. 13ATCh. 6 - Prob. 14ATCh. 6 - Prob. 15ATCh. 6 - Prob. 16ATCh. 6 - Prob. 17ATCh. 6 - Prob. 18ATCh. 6 - Prob. 19ATCh. 6 - Prob. 20ATCh. 6 - Prob. 21ATCh. 6 - Prob. 22ATCh. 6 - Prob. 23ATCh. 6 - Prob. 24ATCh. 6 - Solve the following for the portion, rate, or...Ch. 6 - Prob. 26ATCh. 6 - Prob. 27ATCh. 6 - Prob. 28ATCh. 6 - Solve the following for the portion, rate, or...Ch. 6 - Solve the following for the portion, rate, or...Ch. 6 - Prob. 31ATCh. 6 - Prob. 32ATCh. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - Prob. 42ATCh. 6 - Solve the following word problems for the unknown....Ch. 6 - Solve the following word problems for the unknown....Ch. 6 - 45. An insurance adjuster for UPS found that 12%...Ch. 6 - 46. Morley Fast, a contractor, built a warehouse...Ch. 6 - Use the chart The Rise of E-Books in Education for...Ch. 6 - Use the chart “The Rise of E-Books in Education”...Ch. 6 - Use the chart “The Rise of E-Books in Education”...
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