Well... If you were as well informed as you think you are, you would have asked how my hypothetical researcher arrived at this result, and I would have answered that he, unaware of the city where he was to sample, ended just in a meeting of the KKK. Welcome to the real world, grasshopper! Your neighborhood may be homogeneous, but when you have a heterogeneous country like mine you can not rely on a small sample, for reasons such as I described.