The figures you offer mean nothing because you haven't done any real studies of space alien populations in San Francisco.

I haven't found a really good, simple online explanation of confidence intervals and standard deviation, etc, but basically the confidence interval is a range over which the study has the specified likelihood of being correct. 95% is fairly high confidence... at a lower confidence level, the range is much less. In other words, at a 60% confidence level, the range of estimates might be something like 50,000 - 150,000. (I'm just guessing, but I think you get the idea - or at least someone who wanted to would get the idea).

If you're going to call every statistical study "bogus" because of the confidence intervals, then that would be pretty much all of them.

This page is the best I've located.