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Chapters 1 and 2 - Chapters 1 and 2 Notes(Student What is...

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Chapters 1 and 2 Notes (Student) 1 What is Statistics? Statistics is the science of collecting, classifying, presenting, and interpreting data. Where Do Data Come From? • Individuals – the objects described by a set of data. The objects can be people, animals, or things. • Variable – any characteristic of an individual. Variables can take different values for different individuals. Data Sources: Observational Studies Observational study – observes individuals and measures variables of interest but does not attempt to influence the responses. The purpose of an observational study is to describe some group or situation. Sample survey – type of observational study in which a sample is selected and asked to respond to questions. Examples include public opinion polls, pre-election polls, and TV ratings.
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Chapters 1 and 2 Notes (Student) 2 Data Sources: Experiments • Experiments – deliberately imposes some treatment on individuals in order to observe their responses.
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