Introductory Mathematics for Engineering Applications
1st Edition
ISBN: 9781118141809
Author: Nathan Klingbeil
Publisher: WILEY
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Question
Chapter 4, Problem 3P
To determine
To draw:
The position
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5) State any theorems that you use in determining your solution.
a) Suppose you are given a model with two explanatory variables such that:
Yi = a +ẞ1x1 + ẞ2x2i + Ui, i = 1, 2, ... n
Using partial differentiation derive expressions for the intercept and slope
coefficients for the model above.
[25 marks]
b)
A production function is specified as:
Yi = α + B₁x1i + ẞ2x2i + Ui,
i = 1, 2, ... n,
u₁~N(0,σ²)
where:
y = log(output), x₁ = log(labor input), x2 = log(capital input)
The results are as follows:
x₁ = 10, x2 = 5, ỹ = 12, S11 = 12, S12= 8, S22 = 12, S₁y = 10,
= 8, Syy = 10,
S2y
n = 23 (individual firms)
i) Compute values for the intercept, the slope coefficients and σ².
[20 marks]
ii)
Show that SE (B₁) = 0.102.
[15 marks]
iii)
Test the hypotheses: ẞ1
=
1 and B2 = 0, separately at the 5%
significance level. You may take without calculation that SE (a) = 0.78
and SE (B2) = 0.102
[20 marks]
iv)
Find a 95% confidence interval for the estimate ẞ2.
[20 marks]
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of 2
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The set of all 3 x 3 upper triangular matrices
6) Determine whether each of the following sets, together with the standard
operations, is a vector space. If it is, then simply write 'Vector space'. You do not
have to prove all ten vector space axioms. If it is not, then identify one of the ten
vector space axioms with its number in the attached sheet that fails and also show
that how it fails.
a) The set of all polynomials of degree four or less.
b) The set of all 2 x 2 singular matrices.
c) The set {(x, y) : x ≥ 0, y is a real number}.
d) C[0,1], the set of all continuous functions defined on the interval [0,1].
7) Given u = (-2,1,1) and v = (4,2,0) are two vectors in R³-space. Find u xv and
show that it is orthogonal to both u and v.
8) a) Find the equation of the least squares regression line for the data points
below.
(-2,0), (0,2), (2,2)
b) Graph the points and the line that you found from a) on the same Cartesian
coordinate plane.
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1
of 2
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1) a) Find a matrix P such that PT AP orthogonally diagonalizes the following matrix
A.
= [{² 1]
A =
b) Verify that PT AP gives the correct diagonal form.
2
01
-2
3
2) Given the following matrices A =
-1
0
1] an
and B =
0
1
-3
2
find the following matrices:
a) (AB) b) (BA)T
3) Find the inverse of the following matrix A using Gauss-Jordan elimination or
adjoint of the matrix and check the correctness of your answer (Hint: AA¯¹ = I).
[1 1 1
A = 3 5 4
L3 6 5
4) Solve the following system of linear equations using any one of Cramer's Rule,
Gaussian Elimination, Gauss-Jordan Elimination or Inverse Matrix methods and
check the correctness of your answer.
4x-y-z=1
2x + 2y + 3z = 10
5x-2y-2z = -1
5) a) Describe the zero vector and the additive inverse of a vector in the vector
space, M3,3.
b) Determine if the following set S is a subspace of M3,3 with the standard
operations. Show all appropriate supporting work.
Chapter 4 Solutions
Introductory Mathematics for Engineering Applications
Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - The tip of a one-link robot is represented as a...Ch. 4 - Repeat problem P4-5 if P=14.42 cm and =123.7.Ch. 4 - Repeat problem P4-5 if P=15 cm and =120.Ch. 4 - Repeat problem P4-5 if P=6 in, and =60.Ch. 4 - The x- and y-components of a vector P shown in...Ch. 4 - The x- and y-components of a vector P shown in...
Ch. 4 - The x- and y-components of a vector P shown in...Ch. 4 - The x- and y-components of a vector P shown in...Ch. 4 - A state trooper investigating an accident pushes a...Ch. 4 - Repeat problem P4-13 if the trooper is applying a...Ch. 4 - In a RL circuit, the voltage across the inductor...Ch. 4 - Repeat problem P4-15 if VR=10 V and VL=15 V.Ch. 4 - In an RC circuit, the voltage across the capacitor...Ch. 4 - Repeat problem P4-17 if VR=10 V and VL=20 V.Ch. 4 - In an electrical circuit, voltage V2 lags voltage...Ch. 4 - In an electrical circuit, voltage V2 leads voltage...Ch. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - A ship is crossing a river at a heading of -150...Ch. 4 - Prob. 25PCh. 4 - A two-link planar robot is shown in Fig. P4.26....Ch. 4 - A two-link planar robot is shown in Fig. P4.27....Ch. 4 - A two-link planar robot is shown in Fig. P4.28....Ch. 4 - A two link planar robot is shown in Fig. P4.29....Ch. 4 - Prob. 30PCh. 4 - A weight of 100 kg is suspended from the ceiling...Ch. 4 - Prob. 32PCh. 4 - A vehicle weighing 2000 lb is parked on an...Ch. 4 - A crate of weight W=100 lb sits on a ramp oriented...Ch. 4 - A 500 N television sits on an inclined ramp, shown...Ch. 4 - Prob. 36PCh. 4 - Prob. 37PCh. 4 - A force F=100N is applied to a two-bar truss as...Ch. 4 - Prob. 39PCh. 4 - A waiter extends his arm to hand a plate of food...Ch. 4 - Repeat problem P4-40 if Fm=50 lb, Wa=50 lb, Wp=50...Ch. 4 - Using motion capture, the positions P1 and P2 of...Ch. 4 - Repeat problem P4-42 if P1=1 ft, P2=1.5 ft, 1=45,...
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Similar questions
- Please help solve the following whilst showing all working out. Is part of exam revision questions but no solution is givenarrow_forwardplease help me with this question with working out thanksarrow_forwardPage < 1 of 2 - ZOOM + 1) a) Find a matrix P such that PT AP orthogonally diagonalizes the following matrix A. = [{² 1] A = b) Verify that PT AP gives the correct diagonal form. 2 01 -2 3 2) Given the following matrices A = -1 0 1] an and B = 0 1 -3 2 find the following matrices: a) (AB) b) (BA)T 3) Find the inverse of the following matrix A using Gauss-Jordan elimination or adjoint of the matrix and check the correctness of your answer (Hint: AA¯¹ = I). [1 1 1 A = 3 5 4 L3 6 5 4) Solve the following system of linear equations using any one of Cramer's Rule, Gaussian Elimination, Gauss-Jordan Elimination or Inverse Matrix methods and check the correctness of your answer. 4x-y-z=1 2x + 2y + 3z = 10 5x-2y-2z = -1 5) a) Describe the zero vector and the additive inverse of a vector in the vector space, M3,3. b) Determine if the following set S is a subspace of M3,3 with the standard operations. Show all appropriate supporting work.arrow_forward
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