(06-19-2019, 02:57 PM)The Real Marty Wrote:

(06-19-2019, 01:42 PM)flsprtsgod Wrote: The math is based on random sampling. When you make a thousand calls to the Upper East Side of Manhattan you don't really get that.

That's why I said, "...the trick is to get a random sample, and that's where the real work comes in..."

No one could do 1,000 calls to the Upper East Side of Manhattan and call that a random sample without being charged with fraud. 

But if you can get a true random sample that reflects the entire population the survey applies to, 1,068 is plenty.