I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the statistical differences between two different advertisements, two campaigns, two web pages, etc. I've made a click through rate significance calculator (using a Bernoulli distribution) and a calculator for the average order value (normal distribution, so straight forward 2 sample t test). I'm trying to make a revenue per visit calculator now, but I am stuck on what to do!
The vast majority of visitors to a website will not purchase anything, hence they will have a revenue value equal to zero. Since most visitors will have revenue equal to zero, the distribution will be heavily skewed at zero. The sample sizes should be quite large (n>1000). I'm at a loss for how to formulate a hypothesis test for this metric, any advice would be much appreciated! Thanks!