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# handout1 - Notes Chapter 1 Introduction Bin Wang...

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Chapter 1: Introduction Bin Wang [email protected] Department of Mathematics and Statistics University of South Alabama Mann E7 1/11 What is Statistics Statistics could refer to numerical facts or to the field or discipline of study . Definition Statistics is a group of methods used to collect, analyze, present, and interpret data and to make decisions. Statistics is a science that helps us make sense of data. Mann E7 2/11 Types of statistics Descriptive statistics consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures. Inferential statistics consists of methods that use sample results to help make decisions or predictions about a population. Mann E7 3/11 Population versus sample Definition (Population or target population) A population consists of all elements – individuals, items, or objects – whose characteristics are being studied. The population that is being studied is also called the target population.

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