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To the best of my knowledge, I don't believe there is any equivalent to comparison circles available out of the box in Tableau. I would probably recommend doing any necessary statistical tests prior to loading the data into Tableau, then building your own set of charts and/or dashboard from the output to communicate that information. Box plots in Tableau do show the whisker, hinge, and median values by default in the tooltip, but if you wanted to show more information than that, you would likely have to calculate the values yourself like they do in the article.
Thanks for the quick response, Stephen! This is not what I had hoped to learn about Tableau but at least I can stop searching...