You could manually create the equations and have lookup tables for significance testing. I would recommend using another program however - even Excel has pretty robust tests.
Is there any samples in Tableau? I hope to solve this problem in Tableau, not in other applications. We need to deliver the result to end users, I cannot ask them to use Excel, SAS, or SPSS to answer this type of questions. Then I need to send them all the data.....
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This may not be what you are looking for, but I have an example of a two-proportion z-test in Tableau. I hope it helps:
[inc response rate]
*((1/[test ttl_nbr_contacts])+(1/[ctrl ttl_nbr_contacts raw]))
All the metrics are aggregates. To keep things simple I said if Z > 1.96 or Z < -1.96 then 'Yes' else 'No' (95%).