It looks like the difference of two beta distributions based on the visualization. So, assuming a uniform prior and updating with 39/3000 and 28/3000 conversio

It looks like the difference of two beta distributions based on the visualization. So, assuming a uniform prior and updating with 39/3000 and 28/3000 conversions the difference between the two distributions is greater than zero 91% of the time. It's only guaranteed to be above zero at about the 80% credible interval, and since we started with an uninformed prior that'd be about p=.2? I'm open to correction here.