You should be much more worried about bias than about sample size. See also this calculation, where it is discussed that a sample of 400 is more reliable than a

You should be much more worried about bias than about sample size. See also this calculation, where it is discussed that a sample of 400 is more reliable than a slightly biased sample of a million participants: https://marginalrevolution.com/marginalrevolution/2020/01/big-datasmall-bias.html https://marginalrevolution.com/marginalrevolution/2020/01/bi...