# Lecture32 - ECO220Y Lecture 32 Inference of Two Populations...

This preview shows pages 1–5. Sign up to view the full content.

ECO220Y Lecture 32 CO220 ectu e 32 Inference of Two Populations –Part2 Migiwa Tanaka Reading 13.2, 13.5 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
utline Outline Estimation and hypothesis testing of difference in the means of two populations: μ 1 2 Three Cases: When σ 1 and σ 2 are known When σ 1 and σ 2 are unknown but σ 1 ൌ σ 2 hen nd e unknown and When σ 1 and σ 2 are unknown and σ 1 ് σ 2 Observational Data and Experimental Data revisited ti ti d H th i t ti f diff i th Estimation and Hypothesis testing of difference in the proportions of two populations: p 1 -p 2 2
ata ollection (review of Lecture 9) Data Collection (review of Lecture 9) Research Question: Does the class attendance increase the course grade? Experimental Data: Randomly chosen students are banned from attending, others are forced to attend the lecture Collect the grade records from both groups. gg p Observational Data: Randomly select students and collect attendance and grade records. Natural Experiment Data: Take TTC outage/severe weather days. Collect data of attendance and performance. 3

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
bservational ata Observational Data Endogenous Variable: Variable that is affected by choice or behavior of agents Y (dependent variable) is always endogenous X(independent variable) can be endogenous or not. Very common in observational data Example: Does the class attendance increase the course grade? the class attendance endogenous? Is the class attendance endogenous? Yes, it is chosen by agents(students). oes it cause dogeneity as?
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 03/03/2011 for the course ECON 220 taught by Professor Tanaka during the Spring '11 term at University of Toronto.

### Page1 / 16

Lecture32 - ECO220Y Lecture 32 Inference of Two Populations...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online