Originally Posted by ThumbsUp

No, you're still not understanding. A 600-ct, random sample of pilots at United Airlines will not represent the "average" will of the 15000-ish. The only way to eliminate sample bias would be to make it not random, but targeted. And you'd need more than 600 people to do it. The NC isn't designing the poll, but you also have to know what you are asking for the poll to do to get accurate results.