Data would consist of measurements associated with the roots. For example, the length of roots produced by each plant, or the number of ‘shoots’ branching from each root are two different sets of quantitative data. Quantitative data is usually defined as numerical information, generated or collected through measurements conducted by humans or mediated through devices Alternatively, the information collected in the first example—that people in a given group have different hair texture that can be described and grouped by category—is what we usually call qualitative data. Qualitative data is observable or measurable information that is not (typically) numerical in nature.