Definition of Box Plot:
A box plot, also known as a box and whisker diagram, is a basic graphing tool that displays centering, spread, and distribution of a continuous data set.
A box and whisker plot provides a five-point summary of the data:
- The box represents the middle 50 percent of the data.
- The median is the point where 50 percent of the data is above it and 50 percent below it. (Or left and right depending on orientation.)
- The 25th quartile is where, at most, 25 percent of the data falls below it.
- The 75th quartile is where, at most, 25 percent of the data is above it.
- The whiskers cannot extend any further than 1.5 times the length of the inner quartiles. If you have data points outside this they will show up as outliers.