That's not right. Margin of errors are based on Confidence Intervals (I think .95). If a poll says X happens 50% of the time with a 3% margin of error, that means that 95% of the time you will get X happening between 47-53% of the time. If something happened 48% of the time because of normal random fluctation, the poll is not "wrong" at all.Fat Strat wrote:Well, yes and no, but only because of the methodologies involved. It might very well be that the polls rightly measured the wrong information, but only because the voting demographics were different that projected.clement wrote:These pollsters are a lot more smart and sophisticated than that. They all have models to make sure that the 750 or however many people they poll represent a reasonable cross-section of voters to sample from. That's why when you look at 50 polls from one state, they all more or less say the same thing. Different pollsters will use slightly different methodologies, which might explain why one poll might consistently show a particular candidate up by an average of 8 points and another poll might consistently show a particular candidate up by an average of 3 points. But aside from these kinds of discrepancies, if say, Wisconsin were to flip for McCain, the answer would not be because the polls were wrong.
Of course, we're talking about percentage points here as well. When a poll is "wrong" it's almost always "wrong" within or near their own stated margin of error. Which means it wasn't really wrong at all.
I don't pretend to understand polling, but I do understand that they just don't go Eeny-meeny-miny-moe in a telephone book to get their data set. It's a science, and of course it's constantly being refined. More than the black/women thing I would guess cellphones have a bigger impact than anything, but looking at the data of the average cellphone owner you could incorporate that into your polls.
edit - and note, the poll might not be "wrong" at all if the end result falls outside of it's margin of error, and in fact for the poll to be "right" it HAS to fall outside of it's ME on occasion.

