Fundamentals of Differential Equations and Boundary Value Problems
7th Edition
ISBN: 9780321977106
Author: Nagle, R. Kent
Publisher: Pearson Education, Limited
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Chapter 9.3, Problem 21E
To determine
To evaluate:
The given determinant.
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8.1.8 A civil engineer is analyzing the compressives trength of concrete. Compressive strength is normally distributed with σ2 = 1000(psi)2. A random sample of 12 specimens has a mean compressive strength ofx = 3250 psi.
a. Construct a 95% two-sided confidence interval on mean
compressive strength.
b. Construct a 99% two-sided confidence interval on mean
compressive strength. Compare the width of this confidence
interval with the width of the one found in part (a).
8.1.9Suppose that in Exercise 8.1.8 it is desired to estimate
the compressive strength with an error that is less than 15 psi at
99% confidence. What sample size is required?
8.1.12 Ishikawa et al. [“Evaluation of Adhesiveness of Acinetobacter sp. Tol 5 to Abiotic Surfaces,” Journal of Bioscience and
Bioengineering (Vol. 113(6), pp. 719–725)] studied the adhesion
of various biofilms to solid surfaces for possible use in environmental technologies. Adhesion assay is conducted by measuring
absorbance at A590. Suppose that for the bacterial strain Acinetobacter, five measurements gave readings of 2.69, 5.76, 2.67, 1.62,
and 4.12 dyne-cm2. Assume that the standard deviation is known
to be 0.66 dyne-cm2.
a. Find a 95% confidence interval for the mean adhesion.
b. If the scientists want the confidence interval to be no
wider than 0.55 dyne-cm2, how many observations should
they take?
Answer questions 8.2.1 and 8.2.2 respectively
Chapter 9 Solutions
Fundamentals of Differential Equations and Boundary Value Problems
Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 1 -6, express the given system of...Ch. 9.1 - In Problems 7 -10, express the given higher-order...Ch. 9.1 - In Problems 7 -10, express the given higher-order...Ch. 9.1 - In Problems 7 -10, express the given higher-order...Ch. 9.1 - In Problems 7 -10, express the given higher-order...
Ch. 9.1 - In Problems 11 -13, express the given system of...Ch. 9.1 - In Problems 11 -13, express the given system of...Ch. 9.1 - In Problems 11 -13, express the given system of...Ch. 9.2 - In Problems 1-11, find all solutions to the system...Ch. 9.2 - Prob. 2ECh. 9.2 - Prob. 3ECh. 9.2 - Prob. 4ECh. 9.2 - Prob. 5ECh. 9.2 - Prob. 6ECh. 9.2 - Prob. 7ECh. 9.2 - Prob. 8ECh. 9.2 - Prob. 9ECh. 9.2 - Prob. 10ECh. 9.2 - In Problems 1-11, find all solutions to the system...Ch. 9.2 - Use the Gauss-Jordan elimination algorithm to show...Ch. 9.2 - Prob. 13ECh. 9.2 - Prob. 14ECh. 9.3 - 9.3 Exercises Let A:=[2135] and B:=[1023] Find a...Ch. 9.3 - Prob. 2ECh. 9.3 - Let A=[2411] and B=[21352] Find a AB. b A2=AA b...Ch. 9.3 - Prob. 4ECh. 9.3 - Let A=[1223], B=[1011] and C=[1121] Find a AB. b...Ch. 9.3 - Prob. 6ECh. 9.3 - 9.3 Exercises a. Show that if u and v are each n1...Ch. 9.3 - Prob. 8ECh. 9.3 - Prob. 9ECh. 9.3 - Prob. 10ECh. 9.3 - In Problem 9-14, use the method of Example 1 to...Ch. 9.3 - In Problem 9-14, use the method of Example 1 to...Ch. 9.3 - In Problem 9-14, use the method of Example 1 to...Ch. 9.3 - In Problem 9-14, use the method of Example 1 to...Ch. 9.3 - Prove that if xp satisfy Axp=b, then every...Ch. 9.3 - Let A=[211121112] a. Show that A is singular. b....Ch. 9.3 - In Problems 17-20, find the matrix X1(t) whose...Ch. 9.3 - Prob. 18ECh. 9.3 - Prob. 19ECh. 9.3 - Prob. 20ECh. 9.3 - Prob. 21ECh. 9.3 - Prob. 22ECh. 9.3 - Prob. 23ECh. 9.3 - Prob. 24ECh. 9.3 - Prob. 25ECh. 9.3 - Prob. 26ECh. 9.3 - Prob. 27ECh. 9.3 - Prob. 28ECh. 9.3 - Prob. 29ECh. 9.3 - Prob. 30ECh. 9.3 - Prob. 31ECh. 9.3 - Prob. 32ECh. 9.3 - Prob. 33ECh. 9.3 - 9.3 Exercises Find dx/dt for the given matrix...Ch. 9.3 - 9.3 Exercises Verify that the given vector...Ch. 9.3 - Prob. 36ECh. 9.3 - Prob. 37ECh. 9.3 - Prob. 38ECh. 9.3 - Prob. 39ECh. 9.3 - Prob. 40ECh. 9.3 - Prob. 41ECh. 9.3 - Prob. 42ECh. 9.3 - Prob. 43ECh. 9.4 - In Problems 14, write the given system in the...Ch. 9.4 - Prob. 2ECh. 9.4 - In Problems 14, write the given system in the...Ch. 9.4 - In Problems 14, write the given system in the...Ch. 9.4 - In Problems 5-8, rewrite the given scalar equation...Ch. 9.4 - In Problems 5-8, rewrite the given scalar equation...Ch. 9.4 - In Problems 5-8, rewrite the given scalar equation...Ch. 9.4 - In Problems 5-8, rewrite the given scalar equation...Ch. 9.4 - In Problems 9-12, write the given system as a set...Ch. 9.4 - In Problems 9-12, write the given system as a set...Ch. 9.4 - In Problems 9-12, write the given system as a set...Ch. 9.4 - In Problems 9-12, write the given system as a set...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problems 13-19, determine whether the given...Ch. 9.4 - In Problem 13-19, determine whether the given...Ch. 9.4 - Let...Ch. 9.4 - In Problems 21-24, the given vector functions are...Ch. 9.4 - In Problems 21-24, the given vector functions are...Ch. 9.4 - In Problems 21-24, the given vector functions are...Ch. 9.4 - In Problems 21-24, the given vector functions are...Ch. 9.4 - Verify that the vector functions x1=[etet] and...Ch. 9.4 - Verify that the vector functions...Ch. 9.4 - Prove that the operator define by L[x]:=xAx, where...Ch. 9.4 - Let X(t) be a fundamental matrix for the system...Ch. 9.4 - In Problem 29-30, verify that X(t) is a...Ch. 9.4 - Prob. 30ECh. 9.4 - Prob. 31ECh. 9.4 - Abels Formula. If x1,,xn are any n solutions to...Ch. 9.4 - Using Abels formula Problem 32, confirm that the...Ch. 9.4 - Prob. 34ECh. 9.4 - Prob. 35ECh. 9.4 - Prob. 36ECh. 9.4 - Prob. 37ECh. 9.4 - Prob. 38ECh. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - Prob. 2ECh. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - In Problems 1-8, find the eigenvalues and...Ch. 9.5 - Prob. 8ECh. 9.5 - Prob. 9ECh. 9.5 - Prob. 10ECh. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - In Problems 11-16, find a general solution of the...Ch. 9.5 - Consider the system x (t)=Ax(t),t0 with A=[1331]...Ch. 9.5 - Consider the system x(t)=Ax(t),t0 with A=[2112] a....Ch. 9.5 - In Problems 19-24, find a fundamental matrix for...Ch. 9.5 - In Problems 19-24, find a fundamental matrix for...Ch. 9.5 - In Problems 19-24, find a fundamental matrix for...Ch. 9.5 - In Problems 19-24, find a fundamental matrix for...Ch. 9.5 - In Problems 19-24, find a fundamental matrix for...Ch. 9.5 - In Problems 31-34, solve the given initial value...Ch. 9.5 - In Problems 31-34, solve the given initial value...Ch. 9.5 - In Problems 31-34, solve the given initial value...Ch. 9.5 - In Problems 31-34, solve the given initial value...Ch. 9.5 - a. Show that the matrix A=[1143] has the repeated...Ch. 9.5 - Prob. 36ECh. 9.5 - Prob. 37ECh. 9.5 - Prob. 38ECh. 9.5 - a. Show that the matrix A=[211121221] has the...Ch. 9.5 - Prob. 40ECh. 9.5 - Prob. 41ECh. 9.5 - Prob. 42ECh. 9.5 - Prob. 43ECh. 9.5 - Prob. 44ECh. 9.5 - Mixing Between Interconnected Tanks. Two tanks,...Ch. 9.5 - Prob. 46ECh. 9.5 - Prob. 48ECh. 9.5 - Stability.A homogeneous system x=Ax with constant...Ch. 9.5 - Prob. 50ECh. 9.6 - In Problems 1-4, find a general solution of the...Ch. 9.6 - In Problems 1-4, find a general solution of the...Ch. 9.6 - In Problems 1-4, find a general solution of the...Ch. 9.6 - In Problems 1-4, find a general solution of the...Ch. 9.6 - In Problems 5-9, find a fundamental matrix for the...Ch. 9.6 - In Problems 5-9, find a fundamental matrix for the...Ch. 9.6 - In Problems 5-9, find a fundamental matrix for the...Ch. 9.6 - In Problems 5-9, find a fundamental matrix for the...Ch. 9.6 - 9.6 Exercises Find a fundamental matrix for the...Ch. 9.6 - In Problems 13 and 14, find the solution to the...Ch. 9.6 - In Problems 13 and 14, find the solution to the...Ch. 9.6 - Show that x1(t) and x2(t) given by equations 4 and...Ch. 9.6 - Show that x1(t) and x2(t) given by equations 4 and...Ch. 9.6 - In Problems 17 and 18, use the results of Problem...Ch. 9.6 - In Problems 17 and 18, use the results of Problem...Ch. 9.6 - For the coupled mass-spring system governed by...Ch. 9.6 - For the coupled mas-spring system governed by...Ch. 9.6 - Prob. 21ECh. 9.6 - Prob. 22ECh. 9.6 - Stability: In Problem 49 of Exercises 9.5, page...Ch. 9.6 - a. a For Example 1, page 535, verify that...Ch. 9.7 - In Problems 1-6, use the method of undetermined...Ch. 9.7 - In Problems 1-6, use the method of undetermined...Ch. 9.7 - In Problems 1-6, use the method of undetermined...Ch. 9.7 - Prob. 4ECh. 9.7 - In Problems 1-6, use the method of undetermined...Ch. 9.7 - In Problems 1-6, use the method of undetermined...Ch. 9.7 - In Problems 7-10, use the method of undetermined...Ch. 9.7 - In Problems 7-10, use the method of undetermined...Ch. 9.7 - In Problems 7-10, use the method of undetermined...Ch. 9.7 - In Problems 7-10, use the method of undetermined...Ch. 9.7 - In Problems 11-16, use the variation of parameters...Ch. 9.7 - Prob. 12ECh. 9.7 - In Problems 11-16, use the variation of parameters...Ch. 9.7 - Prob. 14ECh. 9.7 - In Problems 11-16, use the variation of parameters...Ch. 9.7 - In Problems 11-16, use the variation of parameters...Ch. 9.7 - Find the solution to the given system that...Ch. 9.7 - 9.7 Exercises In Problems 21 and 22, find the...Ch. 9.7 - Using matrix algebra techniques and method of...Ch. 9.7 - Prob. 24ECh. 9.7 - To find a general solution to the system...Ch. 9.7 - For the system of Problem 25, we found that a...Ch. 9.7 - .Find a general solution of the system...Ch. 9.7 - Prob. 28ECh. 9.7 - Prob. 29ECh. 9.7 - Prob. 30ECh. 9.7 - Prob. 31ECh. 9.7 - Prob. 32ECh. 9.7 - Prob. 33ECh. 9.7 - Prob. 34ECh. 9.8 - In Problems 1-6, a show that the given matrix A...Ch. 9.8 - Prob. 2ECh. 9.8 - Prob. 3ECh. 9.8 - Prob. 4ECh. 9.8 - Prob. 5ECh. 9.8 - Prob. 6ECh. 9.8 - In Problems 7-10, determine eAt by first finding a...Ch. 9.8 - Prob. 8ECh. 9.8 - Prob. 9ECh. 9.8 - In Problems 7-10, determine eAt by first finding a...Ch. 9.8 - In Problems 11 and 12, determine eAt by using...Ch. 9.8 - In Problems 11 and 12, determine eAt by using...Ch. 9.8 - In Problems 17-20, use the generalized...Ch. 9.8 - Prob. 18ECh. 9.8 - Prob. 19ECh. 9.8 - Prob. 20ECh. 9.8 - Prob. 21ECh. 9.8 - Prob. 22ECh. 9.8 - Prob. 23ECh. 9.8 - Prob. 24ECh. 9.8 - Prob. 25ECh. 9.8 - Prob. 26ECh. 9.RP - In Problems 1-4, find a general solution for the...Ch. 9.RP - In Problems 1-4, find a general solution for the...Ch. 9.RP - In Problems 1-4, find a general solution for the...Ch. 9.RP - In Problems 1-4, find a general solution for the...Ch. 9.RP - In Problems 5 and 6, find a fundamental matrix for...Ch. 9.RP - Prob. 6RPCh. 9.RP - In Problems 7-10, find a general solution for the...Ch. 9.RP - Prob. 8RPCh. 9.RP - In Problems 7-10, find a general solution for the...Ch. 9.RP - In Problems 7-10, find a general solution for the...Ch. 9.RP - In Problems 11 and 12, solve the given initial...Ch. 9.RP - In Problems 11 and 12, solve the given initial...Ch. 9.RP - In Problems 13 and 14, find a general solution for...Ch. 9.RP - In Problems 13 and 14, find a general solution for...Ch. 9.RP - In Problems 15 and 16, find the fundamental matrix...Ch. 9.RP - In Problems 15 and 16, find the fundamental matrix...
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- 8.2.3 A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are 60,139.7 and 3645.94 kilometers. Find a 95% confidence interval on mean tire life. 8.2.4 Determine the t-percentile that is required to construct each of the following one-sided confidence intervals: a. Confidence level = 95%, degrees of freedom = 14 b. Confidence level = 99%, degrees of freedom = 19 c. Confidence level = 99.9%, degrees of freedom = 24arrow_forward8.1.6The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and σ = 3. The past 5 days of plant operation have resulted in the following percent yields: 91.6, 88.75, 90.8, 89.95, and 91.3. Find a 95% two-sided confidence interval on the true mean yield. 8.1.7 .A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is normally distributed with σ = 0.001 millimeters. A random sample of 15 rings has a mean diameter of x = 74.036 millimeters. a. Construct a 99% two-sided confidence interval on the mean piston ring diameter. b. Construct a 99% lower-confidence bound on the mean piston ring diameter. Compare the lower bound of this confi- dence interval with the one in part (a).arrow_forward8.1.2 .Consider the one-sided confidence interval expressions for a mean of a normal population. a. What value of zα would result in a 90% CI? b. What value of zα would result in a 95% CI? c. What value of zα would result in a 99% CI? 8.1.3 A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05) a. What is the value of the sample mean? b. One of these intervals is a 95% CI and the other is a 90% CI. Which one is the 95% CI and why?arrow_forward
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