MICROECONOMICS(LL)COMPANION
21st Edition
ISBN: 9781260713541
Author: McConnell
Publisher: MCG
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Textbook Question
Chapter 9, Problem 2RQ
Which of the following are short-run and which are long-run adjustments? LO9.1
a. Wendy’s builds a new restaurant.
b. Harley-Davidson Corporation hires 200 more production workers.
c. A farmer increases the amount of fertilizer used on his corn crop.
d. An Alcoa aluminum plant adds a third shift of workers.
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Suppose that a random sample of 216 twenty-year-old men is selected from a population and that their heights and weights are recorded. A regression of weight on height
yields
Weight = (-107.3628) + 4.2552 x Height, R2 = 0.875, SER = 11.0160
(2.3220) (0.3348)
where Weight is measured in pounds and Height is measured in inches.
A man has a late growth spurt and grows 1.6200 inches over the course of a year. Construct a confidence interval of 90% for the person's weight gain.
The 90% confidence interval for the person's weight gain is ( ☐ ☐) (in pounds). (Round your responses to two decimal places.)
Suppose that (Y, X) satisfy the assumptions specified here. A random sample of n = 498 is drawn and yields
Ŷ= 6.47 + 5.66X, R2 = 0.83, SER = 5.3
(3.7)
(3.4)
Where the numbers in parentheses are the standard errors of the estimated coefficients B₁ = 6.47 and B₁ = 5.66 respectively.
Suppose you wanted to test that B₁ is zero at the 5% level. That is,
Ho: B₁ = 0 vs. H₁: B₁ #0
Report the t-statistic and p-value for this test.
Definition
The t-statistic is
(Round your response to two decimal places)
☑
The Least Squares Assumptions
Y=Bo+B₁X+u, i = 1,..., n, where
1. The error term u; has conditional mean zero given X;: E (u;|X;) = 0;
2. (Y;, X¡), i = 1,..., n, are independent and identically distributed (i.i.d.) draws from
i
their joint distribution; and
3. Large outliers are unlikely: X; and Y, have nonzero finite fourth moments.
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Chapter 9 Solutions
MICROECONOMICS(LL)COMPANION
Ch. 9.2 - Prob. 1QQCh. 9.2 - Prob. 2QQCh. 9.2 - Prob. 3QQCh. 9.2 - Prob. 4QQCh. 9.5 - Prob. 1QQCh. 9.5 - Prob. 2QQCh. 9.5 - Prob. 3QQCh. 9.5 - Prob. 4QQCh. 9.8 - Prob. 1QQCh. 9.8 - Prob. 2QQ
Ch. 9.8 - Prob. 3QQCh. 9.8 - Prob. 4QQCh. 9 - Prob. 1DQCh. 9 - Prob. 2DQCh. 9 - Prob. 3DQCh. 9 - Prob. 4DQCh. 9 - Prob. 5DQCh. 9 - Prob. 6DQCh. 9 - Prob. 7DQCh. 9 - Prob. 8DQCh. 9 - Prob. 1RQCh. 9 - Which of the following are short-run and which are...Ch. 9 - Prob. 3RQCh. 9 - Indicate how each of the following would shift the...Ch. 9 - Prob. 5RQCh. 9 - Prob. 6RQCh. 9 - Prob. 1PCh. 9 - Prob. 2PCh. 9 - Prob. 3PCh. 9 - Prob. 4P
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