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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 colevery member of the population is called a census....
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 Fall '09
 Wangs

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