The single points on the diagram show the outliers. The values at which the horizontal lines stop at are the values of the upper and lower values of the data. The right edge of the box shows the upper quartile it shows that $25$% of the data lies to the right of the upper quartile value. The left edge of the box represents the lower quartile it shows the value at which the first $25$% of the data falls up to. A box and whisker plotalso called a box plotdisplays the five-number summary of a set of data. This shows that $50$% of the data lies on the left hand side of the median value and $50$% lies on the right hand side. In order to create a box-and-whisker graph, five values are needed: Minimum 25th percentile (first quartile) Median (50th percentile or second quartile) 75th percentile (third quartile) Maximum These values are sometimes collectively referred to as the five-number summary of the data. The line splitting the box in two represents the median value. How to create a box-and-whisker graph with summary values. Interpreting a boxplot can be done once you understand what the different lines mean on a box and whisker diagram. These can be displayed alongside a number line, horizontally or vertically. It is a useful way to compare different sets of data as you can draw more than one boxplot per graph. The shape of the boxplot shows how the data is distributed and it also shows any outliers. Whisker Show the label of upper and lower whisker next to the box plot. For example, when you select Perc 25, 75 from the Range list for Box, the labels for the 75th percentile, median and 25th percentile, will display in the graph. In some box plots, the minimums and maximums outside the first and third quartiles are depicted with lines, which are often called whiskers. Box Show the labels of the top, the median and the bottom lines mext to the box plot. Easily Create a box and a whisker graph with this online Box and Whisker Plot calculator tool. In a box plot, numerical data is divided into quartiles, and a box is drawn between the first and third quartiles, with an additional line drawn along the second quartile to mark the median. because box plots were designed to show median, not mean). This tutorial shows how to create box plots in Excel. Contents Toggle Main Menu 1 Definition 2 Reading a Box and Whisker Plot 2.1 Video Examples 3 Constructing a Box and Whisker Diagram 4 Worked Example 4.1 Video Example 4.2 Common Mistakes 5 Workbook 6 Test Yourself 7 External Resources DefinitionĪ box and whisker plot or diagram (otherwise known as a boxplot), is a graph summarising a set of data. Box plot is the simplest way of representing statistical data on a plot in which a rectangle is drawn to represent the second and third quartiles with a vertical line drawn inside the plot to indicate the median value. Box and whisker charts (box plots) are a useful statistical graph type, but they are not offered in Excels chart types.
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