A Statistics Refresher Course

As the mid-term elections are approaching and the new polls are coming out every day, you may want to refresh your poll-reading skills as well as your general statistics knowledge, plus send your not-as-well-informed readers to learn about it at Echidne's place: Part 1, Part 2, Part 3 and Part 4.
When Part 5 (and beyond, if any), gets posted I will link it here in this post for future reference.

Update: Here is Part 5

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