Bar Graph

A bar graph is also called a bar chart and consists of bars that are separated from each other. It either uses horizontal or vertical bars to show comparisons among categories. The bars can be rectangles, or they can be rectangular boxes (used in three-dimensional plots). One axis of the graph represents the specific categories being compared, a...

Recall that qualitative data represent non-numerical variables such as different hair colors, types of vehicles, or various courses offered by a college. 

For instance, consider a frequency table with the number of students enrolled for each of these courses—Statistics, Biology, Physics, and Chemistry.  

Such qualitative data can b...