In the tutorial, table calculations are used to detect whether data points are outliers. The dashboard author can control the definition of outlier (i.e. 1, 2, or 3 standard deviations from the mean). I think this would work well as a 30-minute tutorial / discussion for the following reasons:
It serves a practical application of statistics in Tableau (i.e. avoiding unnecessary panic or celebration)
It provides an introduction to both table calculations and statistics in Tableau
This is applicable to a wide range of users; it shows new users that this is not impossible to do, but may also be new to veteran users
The content can be combined with additional tutorials for table calculations and/or statistics in Tableau.