Suppose you wanted to compare the performance of three lathes responsible for the rough turning of a motor shaft. Right figure: For comparison, a histogram of the data is also shown, showing the frequency of each value in the data set. The median value is displayed inside the "box." The maximum and minimum values are displayed with vertical lines ("whiskers") connecting the points to the center box. Left figure: The center represents the middle 50%, or 50th percentile of the data set, and is derived using the lower and upper quartile values. The data represented in box and whisker plot format can be seen in Figure 1. Note: For a data set with an even number of values, the median is calculated as the average of the two middle values.
#Box and whisker plot median download
You can also download the box and whisker plot template. The procedure to develop a box and whisker plot comes from the five statistics below.
Use box and whisker plots when you have multiple data sets from independent Plots allow for comparison of data from different categories for easier, more effectiveĭecision-making.
Why Use a Box and Whisker Plot?īox and whisker plots are very effective and easy to read, as they can summarize dataįrom multiple sources and display the results in a single graph.
Plot can provide additional detail while allowing multiple sets of data to be displayed in the same graph. In most cases, a histogram analysis provides a sufficient display, but a box and whisker Quality Glossary Definition: Box and whisker plotĪlso called: box plot, box and whisker diagram, box and whisker plot with outliersĪ box and whisker plot is defined as a graphical method of displaying variation in a set of data.
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