Variable

Definition

A variable is a characteristic or attribute that can take on different values. Variables are used in statistics to represent data collected from observations.

5 Must Know Facts For Your Next Test

1. A variable can be classified as either qualitative (categorical) or quantitative (numerical).
2. Quantitative variables can be further divided into discrete and continuous variables.
3. The independent variable is the one manipulated or controlled in an experiment, while the dependent variable is the one being measured or tested.
4. In statistical formulas, variables are often represented by symbols such as $X$ for random variables.
5. Understanding the type of variable is crucial for selecting appropriate statistical tests and visualizations.

Review Questions

• What are the two main classifications of variables?
• How do independent and dependent variables differ?
• What symbol is commonly used to represent random variables in statistical formulas?

Related terms

Qualitative Variable: A variable that describes categories or qualities, such as colors or labels.

Quantitative Variable: A variable that represents numerical values and quantities, which can be measured.

Random Variable: A variable whose possible values are numerical outcomes of a random phenomenon.