Mylab Math With Pearson Etext -- 18 Week Standalone Access Card -- For Basic Technical Mathematics With Calculus
11th Edition
ISBN: 9780135902912
Author: Allyn J. Washington
Publisher: PEARSON
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Chapter 20.5, Problem 23E
To determine
To solve: The equation
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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]
Page < 2
of 2
- ZOOM +
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.
1. A consumer group claims that the mean annual consumption of cheddar cheese by a person in
the United States is at most 10.3 pounds. A random sample of 100 people in the United States has
a mean annual cheddar cheese consumption of 9.9 pounds. Assume the population standard
deviation is 2.1 pounds. At a = 0.05, can you reject the claim? (Adapted from U.S. Department of
Agriculture)
State the hypotheses:
Calculate the test statistic:
Calculate the P-value:
Conclusion (reject or fail to reject Ho):
2. The CEO of a manufacturing facility claims that the mean workday of the company's assembly
line employees is less than 8.5 hours. A random sample of 25 of the company's assembly line
employees has a mean workday of 8.2 hours. Assume the population standard deviation is 0.5
hour and the population is normally distributed. At a = 0.01, test the CEO's claim.
State the hypotheses:
Calculate the test statistic:
Calculate the P-value:
Conclusion (reject or fail to reject Ho):
Statistics
Chapter 20 Solutions
Mylab Math With Pearson Etext -- 18 Week Standalone Access Card -- For Basic Technical Mathematics With Calculus
Ch. 20.1 - Prob. 1PECh. 20.1 - Prob. 2PECh. 20.1 - Prob. 3PECh. 20.1 - Prob. 1ECh. 20.1 - Prob. 2ECh. 20.1 - In Exercises 36, use a calculator to check the...Ch. 20.1 - Prob. 4ECh. 20.1 - Prob. 5ECh. 20.1 - Prob. 6ECh. 20.1 - Prob. 7E
Ch. 20.1 - Prob. 8ECh. 20.1 - Prob. 9ECh. 20.1 - Prob. 10ECh. 20.1 - Prob. 11ECh. 20.1 - Prob. 12ECh. 20.1 - Prob. 13ECh. 20.1 - Prob. 14ECh. 20.1 - Prob. 15ECh. 20.1 - Prob. 16ECh. 20.1 - Prob. 17ECh. 20.1 - Prob. 18ECh. 20.1 - In Exercises 19–38, prove the given identities.
Ch. 20.1 - Prob. 20ECh. 20.1 - In Exercises 19–38, prove the given identities.
Ch. 20.1 - Prob. 22ECh. 20.1 - Prob. 23ECh. 20.1 - Prob. 24ECh. 20.1 - Prob. 25ECh. 20.1 - Prob. 26ECh. 20.1 - Prob. 27ECh. 20.1 - Prob. 28ECh. 20.1 - Prob. 29ECh. 20.1 - Prob. 30ECh. 20.1 - Prob. 31ECh. 20.1 - Prob. 32ECh. 20.1 - Prob. 33ECh. 20.1 - Prob. 34ECh. 20.1 - Prob. 35ECh. 20.1 - Prob. 36ECh. 20.1 - Prob. 37ECh. 20.1 - Prob. 38ECh. 20.1 - Prob. 39ECh. 20.1 - Prob. 40ECh. 20.1 - Prob. 41ECh. 20.1 - Prob. 42ECh. 20.1 - Prob. 43ECh. 20.1 - Prob. 44ECh. 20.1 - Prob. 45ECh. 20.1 - Prob. 46ECh. 20.1 - Prob. 47ECh. 20.1 - Prob. 48ECh. 20.1 - In Exercises 47–50, for a first-quadrant angle,...Ch. 20.1 - Prob. 50ECh. 20.1 - Prob. 51ECh. 20.1 - Prob. 52ECh. 20.1 - Prob. 53ECh. 20.1 - Prob. 54ECh. 20.1 - Prob. 55ECh. 20.1 - Prob. 56ECh. 20.1 - Prob. 57ECh. 20.1 - Prob. 58ECh. 20.1 - Prob. 59ECh. 20.1 - Prob. 60ECh. 20.1 - Prob. 61ECh. 20.1 - Prob. 62ECh. 20.1 - Prob. 63ECh. 20.1 - In Exercise 63–70, solve the given...Ch. 20.1 - Prob. 65ECh. 20.1 - Prob. 66ECh. 20.1 - Prob. 67ECh. 20.1 - Prob. 68ECh. 20.1 - Prob. 69ECh. 20.1 - Prob. 70ECh. 20.1 - Prob. 71ECh. 20.1 - Prob. 72ECh. 20.1 - Prob. 73ECh. 20.1 - Prob. 74ECh. 20.2 - Prob. 1PECh. 20.2 - Prob. 2PECh. 20.2 - Prob. 1ECh. 20.2 - In Exercises 1 and 2, make the given changes in...Ch. 20.2 - Prob. 3ECh. 20.2 - In Exercises 36, determine the values of the given...Ch. 20.2 - Prob. 5ECh. 20.2 - Prob. 6ECh. 20.2 - Prob. 7ECh. 20.2 - Prob. 8ECh. 20.2 - Prob. 9ECh. 20.2 - Prob. 10ECh. 20.2 - Prob. 11ECh. 20.2 - In Exercises 1120, simplify the given...Ch. 20.2 - Prob. 13ECh. 20.2 - Prob. 14ECh. 20.2 - Prob. 15ECh. 20.2 - Prob. 16ECh. 20.2 - Prob. 17ECh. 20.2 - Prob. 18ECh. 20.2 - Prob. 19ECh. 20.2 - Prob. 20ECh. 20.2 - In Exercises 2124, evaluate each expression by...Ch. 20.2 - In Exercises 21–24, evaluate each expression by...Ch. 20.2 - Prob. 23ECh. 20.2 - Prob. 24ECh. 20.2 - Prob. 25ECh. 20.2 - Prob. 26ECh. 20.2 - Prob. 27ECh. 20.2 - Prob. 28ECh. 20.2 - Prob. 29ECh. 20.2 - Prob. 30ECh. 20.2 - Prob. 31ECh. 20.2 - Prob. 32ECh. 20.2 - Prob. 33ECh. 20.2 - Prob. 34ECh. 20.2 - Prob. 35ECh. 20.2 - Prob. 36ECh. 20.2 - Prob. 37ECh. 20.2 - Prob. 38ECh. 20.2 - Prob. 39ECh. 20.2 - Prob. 40ECh. 20.2 - Prob. 41ECh. 20.2 - In Exercises 4154, solve the given...Ch. 20.2 - Prob. 43ECh. 20.2 - Prob. 44ECh. 20.2 - Prob. 45ECh. 20.2 - Prob. 46ECh. 20.2 - Prob. 47ECh. 20.2 - Prob. 48ECh. 20.2 - Prob. 49ECh. 20.2 - Prob. 50ECh. 20.2 - Prob. 51ECh. 20.2 - Prob. 52ECh. 20.2 - Prob. 53ECh. 20.2 - Prob. 54ECh. 20.3 - Evaluate cos 90° using values for 45°.
Ch. 20.3 - Simplify:
Ch. 20.3 - In Exercises 1–4, make the given changes in the...Ch. 20.3 - In Exercises 1–4, make the given changes in the...Ch. 20.3 - In Exercises 1–4, make the given changes in the...Ch. 20.3 - Prob. 4ECh. 20.3 - Prob. 5ECh. 20.3 - In Exercises 5–8, determine the values of the...Ch. 20.3 - Prob. 7ECh. 20.3 - Prob. 8ECh. 20.3 - Prob. 9ECh. 20.3 - Prob. 10ECh. 20.3 - Prob. 11ECh. 20.3 - In Exercises 9–14, use a calculator to verify the...Ch. 20.3 - Prob. 13ECh. 20.3 - Prob. 14ECh. 20.3 - Prob. 15ECh. 20.3 - Prob. 16ECh. 20.3 - Prob. 17ECh. 20.3 - Prob. 18ECh. 20.3 - Prob. 19ECh. 20.3 - In Exercises 19–30, simplify the given...Ch. 20.3 - In Exercises 19–30, simplify the given...Ch. 20.3 - Prob. 22ECh. 20.3 - Prob. 23ECh. 20.3 - Prob. 24ECh. 20.3 - Prob. 25ECh. 20.3 - Prob. 26ECh. 20.3 - Prob. 27ECh. 20.3 - Prob. 28ECh. 20.3 - Prob. 29ECh. 20.3 - Prob. 30ECh. 20.3 - Prob. 31ECh. 20.3 - Prob. 32ECh. 20.3 - Prob. 33ECh. 20.3 - Prob. 34ECh. 20.3 - Prob. 35ECh. 20.3 - Prob. 36ECh. 20.3 - Prob. 37ECh. 20.3 - Prob. 38ECh. 20.3 - Prob. 39ECh. 20.3 - Prob. 40ECh. 20.3 - Prob. 41ECh. 20.3 - Prob. 42ECh. 20.3 - Prob. 43ECh. 20.3 - Prob. 44ECh. 20.3 - Prob. 45ECh. 20.3 - Prob. 46ECh. 20.3 - Prob. 47ECh. 20.3 - Prob. 48ECh. 20.3 - Prob. 49ECh. 20.3 - Prob. 50ECh. 20.3 - Prob. 51ECh. 20.3 - Prob. 52ECh. 20.3 - Prob. 53ECh. 20.3 - Prob. 54ECh. 20.3 - Prob. 55ECh. 20.3 - Prob. 56ECh. 20.3 - Prob. 57ECh. 20.3 - Prob. 58ECh. 20.3 - Prob. 59ECh. 20.3 - Prob. 60ECh. 20.3 - Prob. 61ECh. 20.3 - Prob. 62ECh. 20.4 - Prob. 1PECh. 20.4 - Prob. 1ECh. 20.4 - Prob. 3ECh. 20.4 - Prob. 4ECh. 20.4 - Prob. 5ECh. 20.4 - Prob. 6ECh. 20.4 - Prob. 7ECh. 20.4 - Prob. 8ECh. 20.4 - Prob. 9ECh. 20.4 - Prob. 10ECh. 20.4 - Prob. 11ECh. 20.4 - Prob. 12ECh. 20.4 - Prob. 13ECh. 20.4 - Prob. 14ECh. 20.4 - Prob. 15ECh. 20.4 - Prob. 16ECh. 20.4 - Prob. 17ECh. 20.4 - Prob. 18ECh. 20.4 - Prob. 19ECh. 20.4 - Prob. 20ECh. 20.4 - Prob. 21ECh. 20.4 - In Exercises 21–24, evaluate the indicated...Ch. 20.4 - Prob. 23ECh. 20.4 - Prob. 24ECh. 20.4 - In Exercises 25–28, derive the required...Ch. 20.4 - Prob. 26ECh. 20.4 - Prob. 27ECh. 20.4 - Prob. 28ECh. 20.4 - Prob. 29ECh. 20.4 - Prob. 30ECh. 20.4 - Prob. 31ECh. 20.4 - Prob. 32ECh. 20.4 - Prob. 33ECh. 20.4 - Prob. 34ECh. 20.4 - Prob. 35ECh. 20.4 - Prob. 36ECh. 20.4 - Prob. 37ECh. 20.4 - Prob. 38ECh. 20.4 - Prob. 39ECh. 20.4 - Prob. 40ECh. 20.4 - Prob. 41ECh. 20.4 - Prob. 42ECh. 20.4 - Prob. 43ECh. 20.4 - Prob. 44ECh. 20.4 - Prob. 45ECh. 20.4 - Prob. 46ECh. 20.4 - Prob. 47ECh. 20.4 - Prob. 48ECh. 20.5 - Prob. 1PECh. 20.5 - Prob. 2PECh. 20.5 - Prob. 1ECh. 20.5 - Prob. 2ECh. 20.5 - Prob. 3ECh. 20.5 - Prob. 4ECh. 20.5 - Prob. 5ECh. 20.5 - In Exercises 5–20, solve the given trigonometric...Ch. 20.5 - Prob. 7ECh. 20.5 - In Exercises 5–20, solve the given trigonometric...Ch. 20.5 - Prob. 9ECh. 20.5 - Prob. 10ECh. 20.5 - Prob. 11ECh. 20.5 - Prob. 12ECh. 20.5 - Prob. 13ECh. 20.5 - Prob. 14ECh. 20.5 - Prob. 15ECh. 20.5 - In Exercises 5–20, solve the given trigonometric...Ch. 20.5 - Prob. 17ECh. 20.5 - Prob. 18ECh. 20.5 - Prob. 19ECh. 20.5 - Prob. 20ECh. 20.5 - Prob. 21ECh. 20.5 - Prob. 22ECh. 20.5 - Prob. 23ECh. 20.5 - Prob. 24ECh. 20.5 - Prob. 25ECh. 20.5 - Prob. 26ECh. 20.5 - Prob. 27ECh. 20.5 - Prob. 28ECh. 20.5 - Prob. 29ECh. 20.5 - Prob. 30ECh. 20.5 - Prob. 31ECh. 20.5 - Prob. 32ECh. 20.5 - Prob. 33ECh. 20.5 - Prob. 34ECh. 20.5 - Prob. 35ECh. 20.5 - Prob. 36ECh. 20.5 - Prob. 37ECh. 20.5 - Prob. 38ECh. 20.5 - Prob. 39ECh. 20.5 - Prob. 40ECh. 20.5 - Prob. 41ECh. 20.5 - Prob. 42ECh. 20.5 - Prob. 43ECh. 20.5 - Prob. 44ECh. 20.5 - Prob. 45ECh. 20.5 - Prob. 46ECh. 20.5 - Prob. 47ECh. 20.5 - Prob. 48ECh. 20.5 - Prob. 49ECh. 20.5 - Prob. 50ECh. 20.5 - Prob. 51ECh. 20.5 - Prob. 52ECh. 20.5 - Prob. 53ECh. 20.5 - Prob. 54ECh. 20.5 - Prob. 55ECh. 20.5 - Prob. 56ECh. 20.5 - Prob. 57ECh. 20.5 - Prob. 58ECh. 20.5 - Prob. 59ECh. 20.5 - Prob. 60ECh. 20.5 - Prob. 61ECh. 20.5 - Prob. 62ECh. 20.6 - Prob. 1PECh. 20.6 - Prob. 2PECh. 20.6 - Prob. 1ECh. 20.6 - Prob. 2ECh. 20.6 - Prob. 3ECh. 20.6 - Prob. 4ECh. 20.6 - Prob. 5ECh. 20.6 - Prob. 6ECh. 20.6 - Prob. 7ECh. 20.6 - Prob. 8ECh. 20.6 - Prob. 9ECh. 20.6 - Prob. 10ECh. 20.6 - Prob. 11ECh. 20.6 -
In Exercises 11—28, evaluate exactly the given...Ch. 20.6 -
In Exercises 11—28, evaluate exactly the given...Ch. 20.6 -
In Exercises 11—28, evaluate exactly the given...Ch. 20.6 - Prob. 15ECh. 20.6 - Prob. 16ECh. 20.6 - Prob. 17ECh. 20.6 -
In Exercises 11—28, evaluate exactly the given...Ch. 20.6 - Prob. 19ECh. 20.6 - Prob. 20ECh. 20.6 - Prob. 21ECh. 20.6 - Prob. 22ECh. 20.6 - Prob. 23ECh. 20.6 - Prob. 24ECh. 20.6 - Prob. 25ECh. 20.6 - Prob. 26ECh. 20.6 - Prob. 27ECh. 20.6 - Prob. 28ECh. 20.6 - Prob. 29ECh. 20.6 - Prob. 30ECh. 20.6 - Prob. 31ECh. 20.6 - Prob. 32ECh. 20.6 -
In Exercises 29—36, use a calculator to evaluate...Ch. 20.6 -
In Exercises 29—36, use a calculator to evaluate...Ch. 20.6 - Prob. 35ECh. 20.6 -
In Exercises 29—36, use a calculator to evaluate...Ch. 20.6 - Prob. 37ECh. 20.6 - Prob. 38ECh. 20.6 - Prob. 39ECh. 20.6 - Prob. 40ECh. 20.6 - Prob. 41ECh. 20.6 - Prob. 42ECh. 20.6 - Prob. 43ECh. 20.6 - Prob. 44ECh. 20.6 - Prob. 45ECh. 20.6 - Prob. 46ECh. 20.6 - Prob. 47ECh. 20.6 - Prob. 48ECh. 20.6 - Prob. 49ECh. 20.6 - Prob. 50ECh. 20.6 - In Exercises 51–56, solve the given problems with...Ch. 20.6 - Prob. 52ECh. 20.6 - Prob. 53ECh. 20.6 - Prob. 54ECh. 20.6 - Prob. 55ECh. 20.6 - Prob. 56ECh. 20.6 - Prob. 57ECh. 20.6 - Prob. 58ECh. 20.6 - Prob. 59ECh. 20.6 - Prob. 60ECh. 20.6 - Prob. 61ECh. 20.6 - Prob. 62ECh. 20.6 - Prob. 63ECh. 20.6 - Prob. 64ECh. 20.6 - Prob. 65ECh. 20.6 - Prob. 66ECh. 20.6 - Prob. 67ECh. 20.6 - Prob. 68ECh. 20.6 - Prob. 69ECh. 20.6 - Prob. 70ECh. 20.6 - Prob. 71ECh. 20.6 - Prob. 72ECh. 20.6 - Prob. 73ECh. 20.6 - Prob. 74ECh. 20.6 - Prob. 75ECh. 20.6 - Prob. 76ECh. 20 - Prob. 1RECh. 20 - Prob. 2RECh. 20 - Prob. 3RECh. 20 - Prob. 4RECh. 20 - Prob. 5RECh. 20 - Prob. 6RECh. 20 - Prob. 7RECh. 20 - Prob. 8RECh. 20 - Prob. 9RECh. 20 - Prob. 10RECh. 20 - Prob. 11RECh. 20 - Prob. 12RECh. 20 - Prob. 13RECh. 20 - Prob. 14RECh. 20 - In Exercises 15–22, simplify the given expressions...Ch. 20 - In Exercises 15–22, simplify the given expressions...Ch. 20 - Prob. 17RECh. 20 - Prob. 18RECh. 20 - Prob. 19RECh. 20 - Prob. 20RECh. 20 - Prob. 21RECh. 20 - Prob. 22RECh. 20 - Prob. 23RECh. 20 - Prob. 24RECh. 20 - Prob. 25RECh. 20 - Prob. 26RECh. 20 - Prob. 27RECh. 20 - Prob. 28RECh. 20 - Prob. 29RECh. 20 - Prob. 30RECh. 20 - Prob. 31RECh. 20 - Prob. 32RECh. 20 - Prob. 33RECh. 20 - Prob. 34RECh. 20 - Prob. 35RECh. 20 - Prob. 36RECh. 20 - Prob. 37RECh. 20 - Prob. 38RECh. 20 - Prob. 39RECh. 20 - Prob. 40RECh. 20 - Prob. 41RECh. 20 - Prob. 42RECh. 20 - Prob. 43RECh. 20 - Prob. 44RECh. 20 - Prob. 45RECh. 20 - Prob. 46RECh. 20 - Prob. 47RECh. 20 - Prob. 48RECh. 20 - Prob. 50RECh. 20 - Prob. 51RECh. 20 - Prob. 52RECh. 20 - Prob. 53RECh. 20 - Prob. 54RECh. 20 -
In Exercises 51—58, simplify the given...Ch. 20 - Prob. 56RECh. 20 - Prob. 57RECh. 20 - Prob. 58RECh. 20 - Prob. 59RECh. 20 - Prob. 60RECh. 20 - Prob. 61RECh. 20 - Prob. 62RECh. 20 - Prob. 63RECh. 20 - Prob. 64RECh. 20 - Prob. 65RECh. 20 - Prob. 66RECh. 20 - Prob. 67RECh. 20 - Prob. 68RECh. 20 - Prob. 69RECh. 20 - Prob. 70RECh. 20 - Prob. 71RECh. 20 - Prob. 72RECh. 20 - Prob. 73RECh. 20 - Prob. 74RECh. 20 - Prob. 75RECh. 20 - Prob. 76RECh. 20 - Prob. 77RECh. 20 - Prob. 78RECh. 20 - Prob. 79RECh. 20 - Prob. 80RECh. 20 - Prob. 81RECh. 20 - Prob. 82RECh. 20 - Prob. 83RECh. 20 - Prob. 84RECh. 20 - Prob. 85RECh. 20 - Prob. 86RECh. 20 - Prob. 87RECh. 20 - Prob. 88RECh. 20 - Prob. 89RECh. 20 - Prob. 90RECh. 20 - Prob. 91RECh. 20 - Prob. 92RECh. 20 - Prob. 93RECh. 20 - Prob. 94RECh. 20 - Prob. 95RECh. 20 - Prob. 96RECh. 20 - Prob. 97RECh. 20 - Prob. 98RECh. 20 - Prob. 99RECh. 20 - Prob. 100RECh. 20 - Prob. 101RECh. 20 - Prob. 102RECh. 20 - Prob. 103RECh. 20 - Prob. 104RECh. 20 - Prob. 105RECh. 20 - Prob. 106RECh. 20 - Prob. 107RECh. 20 - Prob. 108RECh. 20 - Prob. 109RECh. 20 - Prob. 110RECh. 20 - Prob. 111RECh. 20 - Prob. 112RECh. 20 - Prob. 113RECh. 20 - Prob. 114RECh. 20 - Prob. 115RECh. 20 - Prob. 116RECh. 20 - Prob. 117RECh. 20 - Prob. 118RECh. 20 - Prob. 119RECh. 20 - Prob. 120RECh. 20 - Prob. 121RECh. 20 - Prob. 122RECh. 20 - Prob. 123RECh. 20 - Prob. 124RECh. 20 - Prob. 125RECh. 20 - Prob. 126RECh. 20 - Prob. 127RECh. 20 - Prob. 128RECh. 20 - Prob. 129RECh. 20 - Prob. 130RECh. 20 - Prob. 131RECh. 20 - Prob. 1PTCh. 20 - Prob. 2PTCh. 20 - Prob. 3PTCh. 20 - Prob. 4PTCh. 20 - Prob. 5PTCh. 20 - Prob. 6PTCh. 20 - Prob. 7PTCh. 20 - Prob. 8PTCh. 20 - Prob. 9PTCh. 20 - Prob. 10PT
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Author:Beckmann, Sybilla
Publisher:PEARSON
Thinking Mathematically (7th Edition)
Math
ISBN:9780134683713
Author:Robert F. Blitzer
Publisher:PEARSON
Discrete Mathematics With Applications
Math
ISBN:9781337694193
Author:EPP, Susanna S.
Publisher:Cengage Learning,
Pathways To Math Literacy (looseleaf)
Math
ISBN:9781259985607
Author:David Sobecki Professor, Brian A. Mercer
Publisher:McGraw-Hill Education
Find the solutions to a trig equation between 0 and 2pi; Author: Brian McLogan;https://www.youtube.com/watch?v=h7trDHjKCYc;License: Standard YouTube License, CC-BY