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    How to calculate statistical significance for Cost of Sales

    Hey thanks for the reply. Agree that if it is just pure cost we are looking then it doesn't require a test However, what I want to see here is cost of sale. So the sales value is taken into account (i.e. Population A has a cost of sale of 20% vs. population B has a cost of sale of 10%). Any...
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    How to calculate statistical significance for Cost of Sales

    Hi there, I work in ecommerce and we do a lot of AB testing. I am testing 2 populations, and wanted to prove whether sample A has a significantly lower cost of sales vs. sample B [note: cost of sales is calculated by cost / sales i.e. if you spend £20 and got £100 sales, then the cost of...