Objectives and Overview1.1 Statistical Inference1.2 Different Types of Statistical Intervals: An Overview1.3 The Assumption of Sample Data1.4 The Central Role of Practical Assumptions Concerning Representative Data1.5 Enumerative Versus Analytic Studies1.6 Basic Assumptions for Inferences from Enumerative Studies1.7 Considerations in the Conduct of Analytic Studies1.8 Convenience and Judgment Samples1.9 Sampling People1.10 Infinite Population Assumption1.11 Practical Assumptions: Overview1.12 Practical Assumptions: Further Example1.13 Planning the Study1.14 The Role of Statistical Distributions1.15 The Interpretation of Statistical Intervals1.16 Statistical Intervals and Big Data1.17 Comment Concerning Subsequent DiscussionBibliographic Notes