although we can all think of an edge case.. (especially if we know how the sample is biased) eg: a gender survey in the general population that transgender re

although we can all think of an edge case.. (especially if we know how the sample is biased) eg: a gender survey in the general population that transgender respondees do not answer -- ends up with a 99% sample size (all but the transgenders) -- and thus gives a pretty significant bit of data on male:female ratios, etc.. Agreed in principle though.