With enough data from the two correlands, this goes away. I don't know the exact math, but I think there's a way to say the number of variables you're looking at, and the strength of a given correlation, and get a probability that it's really there.
This goes away only in the limit as the sample size goes to infinity.
For a finite sample size (and given a certain set of assumptions) you can establish a range of values within which you believe "true" correlation resides, but this range will never contract to a single point.
People want to tell everything instead of telling the best 15 words. They want to learn everything instead of the best 15 words. In this thread, instead post the best 15-words from a book you've read recently (or anything else). It has to stand on its own. It's not a summary, the whole value needs to be contained in those words.
I'll start in the comments below.
(Voted by the Schelling study group as the best exercise of the meeting.)