Answers to Selected Exercises - Econometrics

Answers to Selected Exercises

For

Principles of Econometrics, Fourth Edition

R. CARTER HILL Louisiana State University WILLIAM E. GRIFFITHS University of Melbourne GUAY C. LIM University of Melbourne

JOHN WILEY & SONS, INC

New York / Chichester / Weinheim / Brisbane / Singapore / Toronto

CONTENTS

Answers for Selected Exercises in:

Probability Primer

1

Chapter 2

The Simple Linear Regression Model

3

Chapter 3

Interval Estimation and Hypothesis Testing

12

Chapter 4

Prediction, Goodness of Fit and Modeling Issues

16

Chapter 5

The Multiple Regression Model

22

Chapter 6

Further Inference in the Multiple Regression Model

29

Chapter 7

Using Indicator Variables

36

Chapter 8

Heteroskedasticity

44

Chapter 9

Regression with Time Series Data: Stationary Variables

51

Chapter 10 Random Regressors and Moment Based Estimation

58

Chapter 11 Simultaneous Equations Models

60

Chapter 15 Panel Data Models

64

Chapter 16 Qualitative and Limited Dependent Variable Models

66

Appendix A Mathematical Tools

69

Appendix B Probability Concepts

72

Appendix C Review of Statistical Inference

76

29 August, 2011

PROBABILITY PRIMER

Exercise Answers

EXERCISE P.1

(a) X is a random variable because attendance is not known prior to the outdoor concert. (b) 1100 (c) 3500 (d) 6,000,000

EXERCISE P.3

0.0478

EXERCISE P.5

(a) 0.5. (b) 0.25

EXERCISE P.7

(a) f (c) 0.15 0.40 0.45

(b) 1.3 (c) 0.51 (d) f (0,0) 0.05 fC (0) fB (0) 0.15 0.15 0.0225

1

Probability Primer, Exercise Answers, Principles of Econometrics, 4e

2

(e)

A

f (a)

5000

0.15

6000

0.50

7000

0.35

(f) 1.0

EXERCISE P.11

(a) 0.0289 (b) 0.3176 (c) 0.8658 (d) 0.444 (e) 1.319

EXERCISE P.13

(a) 0.1056 (b) 0.0062 (c) (a) 0.1587 (b) 0.1265

EXERCISE P.15

(a) 9 (b) 1.5 (c) 0 (d) 109 (e) -66 (f) -0.6055

EXERCISE P.17 (a) 4a b(x1 x2 x3 x4 )

(b) 14 (c) 34 (d) f (4) f (5) f (6) (e) f (0, y) f (1, y) f (2, y) (f) 36

2 CHAPTER

Exercise Answers

EXERCISE 2.3

(a) The line drawn for part (a) will depend on each student's subjective choice about the position of the line. For this reason, it has been omitted.

(b) b2 1.514286 b1 10.8

Figure xr2.3 Observations and fitted line

10

8

6

4

2

(c) y 5.5 x 3.5 y^ 5.5

1

2

3

4

5

6

x

y

Fitted values

3

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