UNIVERSITY OF VICTORIA
Midterm
June 2014
Solutions
NAME: _
STUDENT NUMBER: V00_
Course Name & No.
Section(s)
Inferential Statistics
Economics 246
A01
CRN:
31175
Instructor:
Betty Johnson
Duration:
1hour 50 minutes
This exam has a total of _8_ pages includ
ECON 246: STATISTICAL INFERENCE
TOPIC 4 HYPOTHESIS TESTING
4(b)
Tests for a Single Population
Part 4
Objectives:
To learn about the trade-off between Type I and Type II errors.
To learn about the power curve associated with any test.
To learn about some d
ECON 246: STATISTICAL INFERENCE
TOPIC 3 ESTIMATION
3(b)
Interval Estimation - Part 3
Objective:
To see how to construct interval estimators (Confidence Intervals) in another
important situation:
For the variance of a Normal population.
1
Confidence Interv
ECON 246: STATISTICAL INFERENCE
TOPIC 3 ESTIMATION
3(b)
Interval Estimation - Part 1
Objectives:
To move beyond simple point estimation, to the construction of
meaningful interval estimators.
To learn how to interpret and use interval estimators properly.
ECON 246: STATISTICAL INFERENCE
TOPIC 5 SIMPLE REGRESION ANALYSIS
5(a)
The Simple Linear Regression Model
Part 1
Objectives:
To see how we can extend the Mean Model in a useful way.
To understand what is meant by the Simple Linear Regression Model.
To lea
ECON 246: STATISTICAL INFERENCE
TOPIC 5 SIMPLE REGRESION ANALYSIS
5(b)
Regression vs. Correlation
Objectives:
To derive a measure of how well our linear regression model fits the
sample data.
To relate this measure to the sample correlation between the Y
ECON 246: STATISTICAL INFERENCE
TOPIC 3 ESTIMATION
3(a)
Point Estimation
Objectives:
! To use sample statistics to obtain reliable estimates of interesting
population characteristics.
! To determine exactly how randomness of the sample affects the
reliabi
ECON 246: STATISTICAL INFERENCE
TOPIC 4 HYPOTHESIS TESTING
4(b)
Tests for a Single Population
Part 3
Objective:
Learn how to test hypotheses about the variance of a Normal population.
1
Testing the Variance of a Normal Population
Now consider the situatio
ECON 246: STATISTICAL INFERENCE
TOPIC 4 HYPOTHESIS TESTING
4(b)
Tests for a Single Population
Part 2
Objective:
Learn how to test hypotheses about the mean of a Normal population when
the variance of that population is unknown.
1
Testing the Mean of a Nor
Page 1
UNIVERSITY OF VICTORIA
Economics 246: Statistical Inference
Summer 2014
Assignment #3
(Solutions)
August 8, 2014
Due: Friday 15th of August, 2014, 12 noon. (In the boxes marked Econ 246" near
the Economics Department Office.) Hand in your EViews pr
(i) What null and alternative hypotheses would you establish to determine whether or not sales
are decreasing? Let Ha be one-sided.
H0 : _ _ _ _ _ _ _ _
Ha : _ _ _ _ _ _ _ _
H0 : = $1875
Ha : < $1875
(ii) Find the critical value for Z, assuming that = 0.0
Name:_
Student #:_
Lab Section:_
March 14-18, 2011
Economics 246
Lab Worksheet #9
Variance Tests
Version 1
1)
The materials manager for IFE, Inc. is interested in the variability of the
bolts currently being used. Assume that the manager has no idea of th
UNIVERSITY OF VICTORIA
DEPARTMENT OF ECONOMICS
ECON 246, Summer 2014
Assignment 1
Solutions
th
Due: Friday 18 of July 2014, 12 noon. (In the boxes marked "ECON 246" near the
Economics Department Office)
Number
Country
Consumption
kilolitre
Number
Country
Name:_
Student #:_
Lab Section:_
March 7-11, 2011
Economics 246
Lab Worksheet #8: More Practice With Hypothesis Testing
Version 1
You are interested in purchasing a coffee shop near campus. A particular real estate developer
claims that, on average, the s
UNIVERSITY OF VICTORIA
Economics 246: Statistical Inference
Summer 2014
Solutions to Assignment #2
July 25, 2014
Due: Friday, 1st of August, 2014, 12 noon. (In the box marked Econ 246" near the
Economics Department Office. Hand in your EViews.
Question 1:
Question 2: (8 marks)
A)
H 0 : 1 2 : battery life is the same.
H A : 1 2 : battery life is not the same.
B) What test statistic is appropriate if 12 6.7 and 22 5.2 . (Please print out the appropriate
formula.) (1 mark)
( X1 X 2 ) (1 2 )
ZC
. Population