ECO220Y: Homework 4
Exercises: Chapter 4: 41,49,53, Chapter 5: 15, 25,55,57,
Chapter 6: 1,5,13,15,17,19,29,33,37,45(Calculate also covariance.),
Problems:
(1) Consider the following STATA summary of the variable age taken from the gasoline data posted on

ECO220Y LECTURE 13
REVIEW
MIGIWA TANAKA
READING: CHAPTER 11
1
BASIC STEPS IN STATISTICAL ANALYSIS
Planning
Form
Research
Question
Collect
Data
Theory
Probabilities
Distribution of
Random Variables
Statistical
Inference
Estimation
Hypothesis
Testing
Descr

Homework 9: ECO220Y
Exercises: Chapter 9: 2, 23, 25, 27, 29, 31, 35, 77, 79, 81, 83,
Use Half Normal table (not a compute/calculator) to obtain answers for the following questions: 85, 89, 91, 97,
99, 103
Problems:
(1) What is the mean and variance of Z i

Homework 7: ECO220Y
Exercises: Chapter 9: 1,3,5,7,9,11,41,47,51,55,59
Problems:
(1) A very large discount store is filled with items that have one of five different prices. 48.23 percent of the
items in the store cost 50 cents, 38.58 percent cost $1.60, 1

ECO220Y: Homework 3
Additional Reading: page 97-98, about Stem and Leaf Displays and 5.13 (These are not discussed in class
but you are expected to study by yourself.)
Exercises: Chapter 5: 5,7,9,13,27,33,35,45,47,49,75
Problems:
(1) Using the descriptive

ECO220Y: Homework 5
Exercises: Chapter 6: 57,61, Chapter 7: 3,5,7,9,13,17,21,23,29,33,35,41,47
Additional Reading: The excellent explanation of the phenomenon of regression towards the mean:
http:/www.economics.pomona.edu/GarySmith/StatsRegress/StatsRegre

Homework 6: ECO220Y
Exercises: Chapter 8: 1, 3, 5, 7, 9,10,13,15,17,21,25,29,31,33,39,41,55,57,67,71,73
Problems:
(1) The first step of solving a probability problemunderstanding what types of probabilities are given and
what is being asked forrequires de

ECO220Y LECTURE 15
HYPOTHESIS TESTING (3)
MIGIWA TANAKA
READING: 12.9-10
1
0
0
Density
Density
.2 .2 .4 .4.6 .8.8
.2
.4 .6
.6
RECAP OF HYPOTHESIS TESTING (ON
Population
Population
p?
Objective: Test hypotheses
H0: p=.25
HA: p<.25
Sampling Distribution of