# STA 205 Lecture Notes - Lecture 2: Simple Random Sample, Categorical Variable, Convenience Sampling

## Document Summary

Textbook pages: 1 8; 267 277 (selected topics) How can we define statistics? the science of reasoning from data. Data is a collection of variables recorded for a set of observational units. Data is collected when characteristics are recorded about each individual these are referred to as variables. Knowing what type of variable is measured will prove to be very important the type of variable determines how the variable can be summarized, as well as what type of inference can be conducted. In the space below, list several examples of categorical and quantitative variables: 1 descriptive used to summarize and describe data using graphical and numerical techniques. 2 inferential methods used to make generalizations and draw conclusions about a larger group based on data from a subset of that larger group. Variable any characteristic of a person or thing that can be assigned a category or number.