Data Classification, Range, and Midrange

All statistical data are either categorical (qualitative), or numerical (quantitative). Categorical data represent the attributes and classifications of entries in a data set. For example, in a data set, the entries may simply represent the different ethnic groups, rather than the count of each group. For example, the following lists are qualitative data:

Example 1. Set of nationalities of students in Henry Mason College = {Finish, South African, Tanzanian, Egyptian, Turk, Greek, Russian, Italian, French, Danish, Japanese}

Example 2. Set of science and math courses offered in Radford Benjamin Academy during Spring 2005 = (Algebra I, Algebra II, Chemistry I, Chemistry II, Physics I, Trigonometry, Precalculus}