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I'll always remember in one of my college statistics courses when we were looking at correlations and learned that in Chicago ice cream sales were positively correlated with murder rates. Of course the underlying cause of both going up was the heat, but the correlation didn't explain that. I love statistics, and I agree that having a good BS meter is the most important part of using statistics.
I had to catch some on my own team recently when they were using percentage charts for a survey but not using the same axis scale. Using data incorrectly to bolster your own agenda is a good way to lose all credibility.

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