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The thing with surveys is they can be extremely temperamental. That is why they are rarely worth taking seriously. Most people have this impression that you can just walk down to main street and ask these questions. However that would be the worst thing you could do if your looking for valid results. Worse however is many pollsters do exactly that, or perform phone research in a batch of limited regions. Under the assumption that a small region will be indicative of the larger region. Which is simply not true. What holds true for religious variation might not hold true for affluence.

You need to view any survey with a degree of skepticism. They are exceedingly difficult to do properly. Not that pollsters are necessarily interested in doing them properly. Often its a quick cash grab, or a publicity stunt to attract attention to their services. Basically its the worst kind of science, and every shmuck thinks they can do it. How hard can it be is what they probably think. The truth very hard if your looking to do it very right.