Chapters 1 and 2

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapters 1 and 2 Notes (Student) 2 Data Sources: Experiments • Experiments – deliberately imposes some treatment on individuals in order to observe their responses. ± The purpose of an experiment is to study whether the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online