![]() Want to learn more about making data graphics? Become a member. That’s all there is to it, so the next time you’re thinking of making a bar graph or a histogram, think about using Tukey’s beloved box-and-whisker plot too. Basically, it gives you a good overview of the data’s distribution. For example, if there are more people who eat a lot of burgers than eat a few, the median is going to be higher or the top whisker could be longer than the bottom one. You can also see which way the data sways. The box-and-whisker of course shows you more than just four split groups. If more than one outlier ate the same number of hamburgers, dots are placed side by side. Dots represent those who ate a lot more than normal or a lot less than normal (outliers). Those in the top 25% of hamburger eating (713) are shown by the top “whisker” and dots. Take the top 50% of the group (1,426) who ate more hamburgers they are represented by everything above the median (the white line). ![]() We’ll sort those responses from least to greatest and then graph them with our box-and-whisker. Let’s say we ask 2,852 people (and they miraculously all respond) how many hamburgers they’ve consumed in the past week. In any case, here’s how you read a box plot. It could be that people don’t know about it or maybe are clueless on how to interpret it. Sometimes, the mean is also indicated by a dot or a cross on the box. The vertical line that splits a Box and Whisker Plot in two is the median. It does not display the distribution as accurately as a stem and leaf plot or histogram does. (The data shown in the following illustration is a portion of the data used to create the sample chart shown above.) In Excel, click Insert > Insert Statistic Chart > Box and Whisker as shown in the following illustration. A box and whisker plot is a graph that exhibits data from a five-number summary, including one of the measures of central tendency. The box covers the interquartile interval, where 50 of the data lie. Select your dataeither a single data series, or multiple data series. The box plot, although very useful, seems to get lost in areas outside of Statistics, but I’m not sure why. The left and right sides of a Box and Whisker Plot example are the lower and upper quartiles, respectively. Think of the type of data you might use a histogram with, and the box-and-whisker (or box plot, for short) could probably be useful. Tukey, used to show the distribution of a dataset (at a glance). The box-and-whisker plot is an exploratory graphic, created by John W.
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