Data can be collected in a number of ways; however, the typology of the result can easily be identified by a simple test. If we have to measure a quantity related to a specific event, we collect numbers that identify quantitative variables. If we have to describe the quality of an observed phenomenon, we cannot measure it and we are collecting qualitative variables. Let's understand each one in detail.
Quantitative variables (also called continuous variables) are an expression of a measure and are presented in the form of numerical data. Some examples of quantitative variables are temperature, pressure, and humidity values of a precise location. Quantitative variables can be further categorized as either interval or ratio variables.
Interval variables are variables that assume numeric values that allow comparisons only by difference. It follows that it is possible to order statistical units based on the answers and also to measure...