# Moving from conversion rates to sales volume in A/B tests

there is a short introduction to AB Tests in this question or here at 20bits.

We are currently testing different versions of landing pages and are using the conversion rate (e.g. 4% vs. 5%) to track which version performs better. This is working fine so far.

What I would like to do is start calculating whether a version performs better using the sales volume. So I could say the control version sold \$\$$10.000 with 100 visitors, while the new version sold \$$12.000 with 110 visitors. Is the difference statistically significant?

I would appreciate any points in the right direction. Specifically I am having problems understanding how I can calculate 95% and 99% percentile intervals for the data above.

I can share my Excel sheet for calculating "basic" A/B tests, if that helps.

Thank you in advance for any help!