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## 1.1 Overview

In this chapter we will present a working definition of "statistics" and describe some common practices. Specifically:

- we will define
*statistics*and talk about its usefulness in general terms - we will discuss what a
*random sample*is, how to pick one, and why it is useful - we will discuss some terminology that will be used throughout the course such as
*categorical*and*numeric*variables*ordinal*and*nominal*variables*heterogeneous*and*homogeneous*distribution

There will be an end-of-chapter quiz, so make sure, in particular, you know what all of the above terms mean.