A data set is a collection of facts aggregated for a specific purpose. Elements are the entities on which the data are collected. In the table above, an element of the data set is a particular worker. For instance, worker "Ronnie" is an element of the data set. Age is a quantitative variable because it takes on numerical measurements. However, gender is a qualitative variable because its outcomes are nonnumeric. Of the four variables in the data set in the table above, two are qualitative (Name and Gender) and two are quantitative (Age and Weekly Wage).