I thought this also - but as it turns out - you can make conclusions with really small sample sizes in medicine. For example (this has nothing to do with the p

I thought this also - but as it turns out - you can make conclusions with really small sample sizes in medicine. For example (this has nothing to do with the paper), if the average rate of some condition - some rare brain tumor - is 1 in 50M - and you take 200 COVID-19 patients and 4 of them have it - and they have several of these tumors - you can have high CI & Power with a low sample size. When you're doing conversion rate optimization - it's usually just "did this person make a purchase?" And usually, your base rate is not less than 1/1000... But in medicine, there are ways to measure the severity of the symptoms and a lot of things are quite rare.