Where did I actually say male TB'ers only? It was not poll by the way. I was aware of that it is all genders - but my gut feel is not many female responded. I was mainly responding to the assumption that TBer's are taller than the US male population. You always have to account for standard deviation and the data says it is the same as the US census data for US male, which one could infer. 1- The sample consists of predominantly US male 2- If the poll respondents are representative of the US male to female ratio which I believe is 49/51 , then we have tall female bassists and the men may be shorter. than most US men. Traditionally height census's are always broken up by gender. I still have to find census data that does not break it down. I am not a statistics guy but you are required/expected to know these concepts and the calculations involved in my day to day work and is pervasive in our company.