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[Community Question] Statistics: Calculate confidence-level in A/B-test on revenue

One of our user asked:

I'm doing a split-test and need to calculate the confidence-level of the result. I need to implement the calculations on my own, not using any online-tools or excel.

I managed to do this for binomial values like the conversion rate, but couldn't get any further with non-binomial values like the revenue.

I have a lot of "old" data which I can use to calculate mean, variance, standard deviation and standard error specific for my data. I found some answers here, but (to be honsest) wasn't able to understand how to translate them into code. So any additional help is welcome.


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