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Unformatted text preview: Chapter 1: Introduction 1 Some basic concepts 1. Statistics Statistics could refer to numerical facts or to the field or discipline of study . Definition 1.1 Statistics is a science that helps us make sense of data. 2. Types of statistics Descriptive statistics consists of methods for organizing, dis- playing, and describing data by using tables, graphs, and sum- mary measures. Inferential statistics consists of methods that use sample results to help make decisions or predictions about a population. 3. Population versus sample Definition 1.2 (Population or target population) A population con- sists of all elements individuals, items, or objects whose character- istics are being studied. The population that is being studied is also called the target population. Definition 1.3 (Sample) A portion of population selected for study is referred to as a sample. 1 Definition 1.4 (Census and sample survey) A survey that includes every member of the population is called a census. The technique of col-every member of the population is called a census....
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- Fall '09