Homework TK71: ECO220Y PARTIAL SOLUTIONS
(1) Read TK71 and then answer in your own words.
(2) Answer in your own words. Here is a *sample* in my own words (these are NOT formal definitions).
(a) hypothesis testing: One method of statistical inference wher
Homework TK71: ECO220Y
(1) Read TK71 (posted on the portal) with these questions in mind. Then answer in your own words.
(a) What is the authors main claim?
(b) What evidence and arguments are presented to support the main claim?
(c) Who is the intended a
Homework 17: ECO220Y SOLUTIONS
Problems:
(1) Can simply eye-ball these (can calculate the s.e. of the sample mean):
a.
b.
c.
d.
fail to reject null
reject null in favor of research hypothesis
reject null in favor of research hypothesis
fail to reject null
Homework 17: ECO220Y
Exercises: Chapter 13: 23 26, 28, 31, 32, 41, 43, 51, 54 (NOTE: In all cases do the calculations without
using software and use the statistical tables provided on our course website: use approximation when
necessary.)
Problems:
(1) Wi
Homework 16: ECO220Y SOLUTIONS
Problems:
(1) That statement is wrong because the population mean is a constant and hence probability statements do
not make sense: we dont talk about the probability that 5 is between 3 and 4. We have to be careful to make
Homework 16: ECO220Y
Exercises: Chapter 13: 2, 3, 4, 5, 7 11, 13, 15, 16 (NOTE: In all cases do the calculations without using
software and use the statistical tables provided on our course website: use approximation when necessary.)
Problems:
(1) Suppose
Homework 15: ECO220Y SOLUTIONS
Problems:
(1) FALSE. REALLY FALSE. The idea that there is a trade-off between the P-value and Type II error is a
common misconception based on seriously flawed logic. There is a trade-off between Type I and Type II error
but
Homework 15: ECO220Y
Exercises: Chapter 12: 39, 41, 44, 46
Problems:
(1) True or False? Explain: In hypothesis testing a smaller P-value means a larger Type II error.
(2) This question expands on exercises 44 (Radio ads) and 46 (Radio ads, part 2) in Chap
Homework 14: ECO220Y SOLUTIONS
Problems:
(1) Only the rejection region and not the test statistic.
(2) Further reading.
(3) Define Population 1 as students that had economics training and Population 2 as students that did not have
economics training.
H0:
Homework 14: ECO220Y
Exercises: Chapter 12: 13, 15, 16, 22, 26, 28, 29, 31, 38, 49, 51, 52
Problems:
(1) Doing a two- vs. one-tailed test affects what: the rejection region, the test statistic, neither or both?
(2) I enjoy the writings of the economist De
Homework 13: ECO220Y
Exercises: Chapter 12: 1, 3, 5 7, 9, 10, 18, 19
Problems:
(1) An economist wants to show that the supply of electricity is inelastic. What is the research hypothesis?
What is the null hypothesis?
(2) An economist wants to show that th