In this chapter, you will learn how to:

2.1 Recognize the essential features of a variable.

2.2 Differentiate between nominal, ordinal, and interval levels of measurement, understanding their  implications for data analysis.

2.3 Calculate and interpret measures of central tendency and measures of dispersion, such as range and variance.

2.4 Develop strategies to effectively describe and analyze nominal-level variables.

2.5 Apply appropriate methods to describe and analyze ordinal-level variables.

2.6 Utilize appropriate methods to analyze interval-level variables to describe their distribution and variation.