How to draw a graph of core density using Haskell

Question

I have a set of timestamps (each one corresponds to the student’s view), and I wanted to look at them graphically. I know that criterionKDE uses and makes a good plot, and it looks like it depends on the package statisticsthat provides the function kde, but I could not trace the code criterionto see how it is used.

Ideally, the answer will be at least a piece of code that creates the image. An explanation of what criteriondoes in this case would also be welcome.