- ISBN: 9781118425213 | 1118425219
- Cover: Paperback
- Copyright: 12/31/2013
A statistics text specifically geared towards the education community. This text gives educators the statistical knowledge and skills necessary in everyday classroom teaching, in running schools, and in professional development pursuits. It emphasises conceptual development with an engaging style and clear exposition.
Theodore Coladarci is Professor of Educational Psychology at the University of Maine. He has published extensively, including Elementary Descriptive Statistics, which he co-authored with A.P. Coladarci.
Chapter 1 Introduction 1
1.1 Why Statistics? 1
1.2 Descriptive Statistics 2
1.3 Inferential Statistics 3
1.4 The Role of Statistics in Educational Research 4
1.5 Variables and Their Measurement 5
1.6 Some Tips on Studying Statistics 8
PART 1 DESCRIPTIVE STATISTICS 13
Chapter 2 Frequency Distributions 14
2.1 Why Organize Data? 14
2.2 Frequency Distributions for Quantitative Variables 14
2.3 Grouped Scores 15
2.4 Some Guidelines for Forming Class Intervals 17
2.5 Constructing a Grouped-Data Frequency Distribution 18
2.6 The Relative Frequency Distribution 19
2.7 Exact Limits 21
2.8 The Cumulative Percentage Frequency Distribution 22
2.9 Percentile Ranks 23
2.10 Frequency Distributions for Qualitative Variables 25
2.11 Summary 26
Chapter 3 Graphic Representation 34
3.1 Why Graph Data? 34
3.2 Graphing Qualitative Data: The Bar Chart 34
3.3 Graphing Quantitative Data: The Histogram 35
3.4 Relative Frequency and Proportional Area 39
3.5 Characteristics of Frequency Distributions 41
3.6 The Box Plot 44
3.7 Summary 45
Chapter 4 Central Tendency 52
4.1 The Concept of Central Tendency 52
4.2 The Mode 52
4.3 The Median 53
4.4 The Arithmetic Mean 54
4.5 Central Tendency and Distribution Symmetry 57
4.6 Which Measure of Central Tendency to Use? 59
4.7 Summary 59
Chapter 5 Variability 66
5.1 Central Tendency Is Not Enough: The Importance of Variability 66
5.2 The Range 67
5.3 Variability and Deviations From the Mean 68
5.4 The Variance 69
5.5 The Standard Deviation 70
5.6 The Predominance of the Variance and Standard Deviation 71
5.7 The Standard Deviation and the Normal Distribution 72
5.8 Comparing Means of Two Distributions: The Relevance of Variability 73
5.9 In the Denominator: n Versus n −1 75
5.10 Summary 76
Chapter 6 Normal Distributions and Standard Scores 81
6.1 A Little History: Sir Francis Galton and the Normal Curve 81
6.2 Properties of the Normal Curve 82
6.3 More on the Standard Deviation and the Normal Distribution 82
6.4 z Scores 84
6.5 The Normal Curve Table 87
6.6 Finding Area When the Score Is Known 88
6.7 Reversing the Process: Finding Scores When the Area Is Known 91
6.8 Comparing Scores From Different Distributions 93
6.9 Interpreting Effect Size 94
6.10 Percentile Ranks and the Normal Distribution 96
6.11 Other Standard Scores 97
6.12 Standard Scores Do Not “Normalize” a Distribution 98
6.13 The Normal Curve and Probability 98
6.14 Summary 99
Chapter 7 Correlation 106
7.1 The Concept of Association 106
7.2 Bivariate Distributions and Scatterplots 106
7.3 The Covariance 111
7.4 The Pearson r 117
7.5 Computation of r: The Calculating Formula 118
7.6 Correlation and Causation 120
7.7 Factors Influencing Pearson r 122
7.8 Judging the Strength of Association: r2 125
7.9 Other Correlation Coefficients 127
7.10 Summary 127
Chapter 8 Regression and Prediction 134
8.1 Correlation Versus Prediction 134
8.2 Determining the Line of Best Fit 135
8.3 The Regression Equation in Terms of Raw Scores 138
8.4 Interpreting the Raw-Score Slope 141
8.5 The Regression Equation in Terms of z Scores 141
8.6 Some Insights Regarding Correlation and Prediction 142
8.7 Regression and Sums of Squares 145
8.8 Residuals and Unexplained Variation 147
8.9 Measuring the Margin of Prediction Error: The Standard Error of Estimate 148
8.10 Correlation and Causality (Revisited) 152
8.11 Summary 153
PART 2 INFERENTIAL STATISTICS 163
Chapter 9 Probability and Probability Distributions 164
9.1 Statistical Inference: Accounting for Chance in Sample Results 164
9.2 Probability: The Study of Chance 165
9.3 Definition of Probability 166
9.4 Probability Distributions 168
9.5 The OR/addition Rule 169
9.6 The AND/Multiplication Rule 171
9.7 The Normal Curve as a Probability Distribution 172
9.8 “So What?”—Probability Distributions as the Basis for Statistical Inference 174
9.9 Summary 175
Chapter 10 Sampling Distributions 179
10.1 From Coins to Means 179
10.2 Samples and Populations 180
10.3 Statistics and Parameters 181
10.4 Random Sampling Model 181
10.5 Random Sampling in Practice 183
10.6 Sampling Distributions of Means 184
10.7 Characteristics of a Sampling Distribution of Means 185
10.8 Using a Sampling Distribution of Means to Determine Probabilities 188
10.9 The Importance of Sample Size (n) 191
10.10 Generality of the Concept of a Sampling Distribution 193
10.11 Summary 193
Chapter 11 Testing Statistical Hypotheses About μ When σ Is Known: The One-Sample z Test 199
11.1 Testing a Hypothesis About μ: Does “Homeschooling” Make a Difference? 199
11.2 Dr. Meyer’s Problem in a Nutshell 200
11.3 The Statistical Hypotheses: H0 and H1 201
11.4 The Test Statistic z 202
11.5 The Probability of the Test Statistic: The p Value 203
11.6 The Decision Criterion: Level of Significance (α) 204
11.7 The Level of Significance and Decision Error 207
11.8 The Nature and Role of H0 and H1 209
11.9 Rejection Versus Retention of H0 209
11.10 Statistical Significance Versus Importance 210
11.11 Directional and Nondirectional Alternative Hypotheses 212
11.12 The Substantive Versus the Statistical 214
11.13 Summary 215
Chapter 12 Estimation 222
12.1 Hypothesis Testing Versus Estimation 222
12.2 Point Estimation Versus Interval Estimation 223
12.3 Constructing an Interval Estimate of μ 224
12.4 Interval Width and Level of Confidence 226
12.5 Interval Width and Sample Size 227
12.6 Interval Estimation and Hypothesis Testing 228
12.7 Advantages of Interval Estimation 230
12.8 Summary 230
Chapter 13 Testing Statistical Hypotheses About μ When σ Is Not Known: The One-Sample t Test 235
13.1 Reality: σ Often Is Unknown 235
13.2 Estimating the Standard Error of the Mean 236
13.3 The Test Statistic t 237
13.4 Degrees of Freedom 238
13.5 The Sampling Distribution of Student’s t 239
13.6 An Application of Student’s t 242
13.7 Assumption of Population Normality 244
13.8 Levels of Significance Versus p Values 244
13.9 Constructing a Confidence Interval for μ When σ Is Not Known 246
13.10 Summary 247
Chapter 14 Comparing the Means of Two Populations: Independent Samples 253
14.1 From One Mu (μ) to Two 253
14.2 Statistical Hypotheses 254
14.3 The Sampling Distribution of Differences Between Means 255
14.4 Estimating σx̄1-x̄2 257
14.5 The t Test for Two Independent Samples 259
14.6 Testing Hypotheses About Two Independent Means: An Example 260
14.7 Interval Estimation of μ1 − μ2 262
14.8 Appraising the Magnitude of a Difference: Measures of Effect Size for − 264
14.9 How Were Groups Formed? The Role of Randomization 268
14.10 Statistical Inferences and Nonstatistical Generalizations 269
14.11 Summary 270
Chapter 15 Comparing the Means of Dependent Samples 278
15.1 The Meaning of “Dependent” 278
15.2 Standard Error of the Difference Between Dependent Means 279
15.3 Degrees of Freedom 281
15.4 The t Test for Two Dependent Samples 281
15.5 Testing Hypotheses About Two Dependent Means: An Example 283
15.6 Interval Estimation of μD 286
15.7 Summary 287
Chapter 16 Comparing the Means of Three or More Independent Samples: One-Way Analysis of Variance 294
16.1 Comparing More Than Two Groups: Why Not Multiplet Tests? 294
16.2 The Statistical Hypotheses in One-Way ANOVA 295
16.3 The Logic of One-Way ANOVA: An Overview 296
16.4 Alison’s Reply to Gregory 299
16.5 Partitioning the Sums of Squares 300
16.6 Within-Groups and Between- Groups Variance Estimates 303
16.7 The F Test 304
16.8 Tukey’s “HSD” Test 306
16.9 Interval Estimation of μi − μj 308
16.10 One-Way ANOVA: Summarizing the Steps 309
16.11 Estimating the Strength of the Treatment Effect: Effect Size (ω2) 311
16.12 ANOVA Assumptions (and Other Considerations) 312
16.13 Summary 313
Chapter 17 Inferences about the Pearson Correlation Coefficient 322
17.1 From μ to ρ 322
17.2 The Sampling Distribution of r When ρ = 0 322
17.3 Testing the Statistical Hypothesis That ρ = 0 324
17.4 An Example 324
17.5 In Brief: Student’s t Distribution and the Regression Slope (b) 326
17.6 Table E 326
17.7 The Role of n in the Statistical Significance of r 328
17.8 Statistical Significance Versus Importance (Again) 329
17.9 Testing Hypotheses Other Than ρ = 0 329
17.10 Interval Estimation of ρ 330
17.11 Summary 332
Chapter 18 Making Inferences From Frequency Data 338
18.1 Frequency Data Versus Score Data 338
18.2 A Problem Involving Frequencies: The One-Variable Case 339
18.3 χ2: A Measure of Discrepancy Between Expected and Observed Frequencies 340
18.4 The Sampling Distribution of χ2 341
18.5 Completion of the Voter Survey Problem: The χ2 Goodness-of-Fit Test 343
18.6 The χ2 Test of a Single Proportion 344
18.7 Interval Estimate of a Single Proportion 345
18.8 When There Are Two Variables: The χ2 Test of Independence 347
18.9 Finding Expected Frequencies in the Two-Variable Case 348
18.10 Calculating the Two-Variable χ2 350
18.11 The χ2 Test of Independence: Summarizing the Steps 351
18.12 The 2 × 2 Contingency Table 352
18.13 Testing a Difference Between Two Proportions 353
18.14 The Independence of Observations 353
18.15 χ2 and Quantitative Variables 354
18.16 Other Considerations 355
18.17 Summary 355
Chapter 19 Statistical “Power” (and How to Increase It) 363
19.1 The Power of a Statistical Test 363
19.2 Power and Type II Error 364
19.3 Effect Size (Revisited) 365
19.4 Factors Affecting Power: The Effect Size 366
19.5 Factors Affecting Power: Sample Size 367
19.6 Additional Factors Affecting Power 368
19.7 Significance Versus Importance 369
19.8 Selecting an Appropriate Sample Size 370
19.9 Summary 373 Epilogue A Note on (Almost) Assumption-Free Tests 379
References 380
Appendix A Review of Basic Mathematics 382
A.1 Introduction 382
A.2 Symbols and Their Meaning 382
A.3 Arithmetic Operations Involving Positive and Negative Numbers 383
A.4 Squares and Square Roots 383
A.5 Fractions 384
A.6 Operations Involving Parentheses 385
A.7 Approximate Numbers, Computational Accuracy, and Rounding 386
Appendix B Answers to Selected End-of-Chapter Problems 387
Appendix C Statistical Tables 408
Glossary 421
Index 427
Useful Formulas 433
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