Principles of Economics 2e
2nd Edition
ISBN: 9781947172364
Author: Steven A. Greenlaw; David Shapiro
Publisher: OpenStax
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Textbook Question
Chapter 19, Problem 21CTQ
What does
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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.
Chapter 19 Solutions
Principles of Economics 2e
Ch. 19 - Country A has export sales of 20 billion,...Ch. 19 - Which of the following are included in GDP, and...Ch. 19 - Using data from Table 19.5 how much of the nominal...Ch. 19 - Without looking at Table 19.7, return to Figure...Ch. 19 - According to Table 19.7, how often have recessions...Ch. 19 - According to Table 19.7, how long has the average...Ch. 19 - According to Table 19.7, how long has the average...Ch. 19 - Is it possible for GDP to rise while at the same...Ch. 19 - The Central African Republic has a GDP of...Ch. 19 - Explain briefly whether each of the following...
Ch. 19 - What are the main components of measuring GDP with...Ch. 19 - What are the main components of measuring GDP with...Ch. 19 - Would you usually expect GDP as measured by what...Ch. 19 - Why must you avoid double counting when measuring...Ch. 19 - What is the difference between a series of...Ch. 19 - How do you convert a series of nominal economic...Ch. 19 - What are typical GDP patterns for a high-income...Ch. 19 - What are the two main difficulties that arise in...Ch. 19 - List some of the reasons why economists should not...Ch. 19 - U.S. macroeconomic data are among the best in the...Ch. 19 - What does GDP not tell us about the economy?Ch. 19 - Should people typically pay more attention to...Ch. 19 - Why do you suppose that U.S. GDP is so much higher...Ch. 19 - Why do you think that GDP does not grow at a...Ch. 19 - Cross country comparisons of GDP per capita...Ch. 19 - Why might per capita GDP be only an imperfect...Ch. 19 - How might you measure a green GDP?Ch. 19 - Last year, a small nation with abundant forests...Ch. 19 - The prime interest rate is the rate that banks...Ch. 19 - A mortgage 105m is a loan that a person makes to...Ch. 19 - Ethiopia has a GDP of 8 billion (measured in U.S....Ch. 19 - In 1980, Denmark had a GDP of 70 billion (measured...Ch. 19 - The Czech Republic has 3 GDP of 1,800 billion...
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