Box Plots show summary information for data – the box shows the median and quartiles and the whiskers are extended to all points which are not outliers.

A very clear description for younger students can be found on **BBC Bitesize**. For A Level Students the Centre for Innovation in Mathematics Teaching includes Box Plots in **Chapter 3** of their **Statistics text** (page 26 of the pdf file, which is page 76 of the text).

Box Plots are particularly useful when comparing one or more distributions;

To help older students think further about about outliers and skew, have a look at this excellent illustration of Nobel Prize data from **Plotly**. Who is that **outlier** for the Nobel Peace Prize?!

Note that it is possible to display points with Box Plots in **Plotly**, the following data and charts demonstrates skew well:

You can learn more about Plotly for graphing and sharing your data here: **Learn and explore Plotly **