Randomly choosing these customers helps reduce bias and is great for getting general results. Stratified sampling breaks a population into different subgroups (strata) based on specific ...

As part of our #TakeASample Science Club, Science Friday asked its Twitter audience a few simple survey questions, and they answered by the thousands. But do the data mean anything?

New Delhi's air pollution is more severe than previously estimated with particles absorbing atmospheric water vapour leading to particulate matter levels across the city being underestimated by up to ...