Hogg Craig Introduction to Mathematical Statistics
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Introduction to
Mathematical Statistics
Eighth Edition
Robert V. Hogg
University of Iowa
Joseph W. McKean
Western Michigan University
Allen T. Craig
Late Professor of Statistics University of Iowa
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Library of Congress Cataloging-in-Publications Data Names: Hogg, Robert V., author. | McKean, Joseph W., 1944- author. | Craig,
Allen T. (Allen Thornton), 1905- author. Title: Introduction to mathematical statistics / Robert V. Hogg, Late Professor of Statistics,
University of Iowa, Joseph W. McKean, Western Michigan University, Allen T. Craig, Late Professor of Statistics, University of Iowa. Description: Eighth edition. | Boston : Pearson, [2019] | Includes bibliographical references and index. Identifiers: LCCN 2017033015| ISBN 9780134686998 | ISBN 0134686993 Subjects: LCSH: Mathematical statistics. Classification: LCC QA276 .H59 2019 | DDC 519.5?dc23 LC record available at
ISBN 13: 978-0-13-468699-8
ISBN 10: 0-13-468699-3
Dedicated to my wife Marge and to the memory of Bob Hogg
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Contents
Preface
xi
1 Probability and Distributions
1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Review of Set Theory . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2 Set Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 The Probability Set Function . . . . . . . . . . . . . . . . . . . . . . 12
1.3.1 Counting Rules . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.3.2 Additional Properties of Probability . . . . . . . . . . . . . . 18
1.4 Conditional Probability and Independence . . . . . . . . . . . . . . . 23
1.4.1 Independence . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.4.2 Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.5 Random Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
1.6 Discrete Random Variables . . . . . . . . . . . . . . . . . . . . . . . 45
1.6.1 Transformations . . . . . . . . . . . . . . . . . . . . . . . . . 47
1.7 Continuous Random Variables . . . . . . . . . . . . . . . . . . . . . 49
1.7.1 Quantiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
1.7.2 Transformations . . . . . . . . . . . . . . . . . . . . . . . . . 53
1.7.3 Mixtures of Discrete and Continuous Type Distributions . . . 56
1.8 Expectation of a Random Variable . . . . . . . . . . . . . . . . . . . 60
1.8.1 R Computation for an Estimation of the Expected Gain . . . 65
1.9 Some Special Expectations . . . . . . . . . . . . . . . . . . . . . . . 68
1.10 Important Inequalities . . . . . . . . . . . . . . . . . . . . . . . . . . 78
2 Multivariate Distributions
85
2.1 Distributions of Two Random Variables . . . . . . . . . . . . . . . . 85
2.1.1 Marginal Distributions . . . . . . . . . . . . . . . . . . . . . . 89
2.1.2 Expectation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
2.2 Transformations: Bivariate Random Variables . . . . . . . . . . . . . 100
2.3 Conditional Distributions and Expectations . . . . . . . . . . . . . . 109
2.4 Independent Random Variables . . . . . . . . . . . . . . . . . . . . . 117
2.5 The Correlation Coefficient . . . . . . . . . . . . . . . . . . . . . . . 125
2.6 Extension to Several Random Variables . . . . . . . . . . . . . . . . 134
v
vi
Contents
2.6.1 Multivariate Variance-Covariance Matrix . . . . . . . . . . . 140 2.7 Transformations for Several Random Variables . . . . . . . . . . . . 143 2.8 Linear Combinations of Random Variables . . . . . . . . . . . . . . . 151
3 Some Special Distributions
155
3.1 The Binomial and Related Distributions . . . . . . . . . . . . . . . . 155
3.1.1 Negative Binomial and Geometric Distributions . . . . . . . . 159
3.1.2 Multinomial Distribution . . . . . . . . . . . . . . . . . . . . 160
3.1.3 Hypergeometric Distribution . . . . . . . . . . . . . . . . . . 162
3.2 The Poisson Distribution . . . . . . . . . . . . . . . . . . . . . . . . 167 3.3 The , 2, and Distributions . . . . . . . . . . . . . . . . . . . . . 173
3.3.1 The 2-Distribution . . . . . . . . . . . . . . . . . . . . . . . 178
3.3.2 The -Distribution . . . . . . . . . . . . . . . . . . . . . . . . 180
3.4 The Normal Distribution . . . . . . . . . . . . . . . . . . . . . . . . . 186 3.4.1 Contaminated Normals . . . . . . . . . . . . . . . . . . . . . 193
3.5 The Multivariate Normal Distribution . . . . . . . . . . . . . . . . . 198
3.5.1 Bivariate Normal Distribution . . . . . . . . . . . . . . . . . . 198 3.5.2 Multivariate Normal Distribution, General Case . . . . . . . 199 3.5.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
3.6 t- and F -Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . 210
3.6.1 The t-distribution . . . . . . . . . . . . . . . . . . . . . . . . 210
3.6.2 The F -distribution . . . . . . . . . . . . . . . . . . . . . . . . 212
3.6.3 Student's Theorem . . . . . . . . . . . . . . . . . . . . . . . . 214 3.7 Mixture Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . 218
4 Some Elementary Statistical Inferences
225
4.1 Sampling and Statistics . . . . . . . . . . . . . . . . . . . . . . . . . 225
4.1.1 Point Estimators . . . . . . . . . . . . . . . . . . . . . . . . . 226
4.1.2 Histogram Estimates of pmfs and pdfs . . . . . . . . . . . . . 230
4.2 Confidence Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
4.2.1 Confidence Intervals for Difference in Means . . . . . . . . . . 241
4.2.2 Confidence Interval for Difference in Proportions . . . . . . . 243 4.3 Confidence Intervals for Parameters of Discrete Distributions . . . . 248
4.4 Order Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
4.4.1 Quantiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
4.4.2 Confidence Intervals for Quantiles . . . . . . . . . . . . . . . 261
4.5 Introduction to Hypothesis Testing . . . . . . . . . . . . . . . . . . . 267
4.6 Additional Comments About Statistical Tests . . . . . . . . . . . . . 275
4.6.1 Observed Significance Level, p-value . . . . . . . . . . . . . . 279
4.7 Chi-Square Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
4.8 The Method of Monte Carlo . . . . . . . . . . . . . . . . . . . . . . . 292
4.8.1 Accept?Reject Generation Algorithm . . . . . . . . . . . . . . 298
4.9 Bootstrap Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 303
4.9.1 Percentile Bootstrap Confidence Intervals . . . . . . . . . . . 303
4.9.2 Bootstrap Testing Procedures . . . . . . . . . . . . . . . . . . 308 4.10 Tolerance Limits for Distributions . . . . . . . . . . . . . . . . . . . 315
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