> can 24k people from 32 countries (so, 750 in each) be representative of 8 billion in 200+ countries? Yes, assuming they are sampled randomly. If they aren't,

> can 24k people from 32 countries (so, 750 in each) be representative of 8 billion in 200+ countries? Yes, assuming they are sampled randomly. If they aren't, a bigger sample size won't help anyways: https://sample-size.net/confidence-interval-proportion/ https://sample-size.net/confidence-interval-proportion/