This looks really useful! Is there a typo in example code, where the 'So' variable is assumed to be normally distributed (I think it's meant to be the 'Prob' variable)?

I tended to avoid statistics in the past, knowing just enough to realise how easy it is to draw wrong or misleading conclusions. I recently had to perform some data analysis and got a bit paralysed at the thought of choosing the wrong approach; something like Tea would have been great, if only to give external validation/justification to the decisions I made.