Box And Whisker Plot Median. A box plot also known as box and whisker plot is a type of chart often used in descriptive data analysis to visually show the distribution of numerical data and skewness by displaying the data quartiles or percentiles averages. A vertical line goes through the box at the median.
The whiskers small lines go from each quartile towards the minimum or maximum value as shown in the figure below. A box and whisker plotalso called a box plotdisplays the five-number summary of a set of data. To create a box-and-whisker plot we start by ordering our data that is putting the values in numerical order if they arent ordered already.
1 2 4 4 5 6 8 8 9 LEAST VALUE 1 LOWER QUARTILE 3 MEDIAN 5.
Now the reason we call the two lines extending from the edge of the box whiskers is simply because they look like whiskers or mustache especially mustache of a cat. The term box plot refers to an outlier box plot. You can only inveigle a type of Excel chart into boxes and whiskers. Figure 1 Box and Whisker Plot Example Left figure.
