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A curvilinear relationship example that ISN'T Yerkes-Dodson.

I'm such a sucker for beer-related statistics examples (1, 2, 3). Here is example 4.

Now, I don't know about the rest of you psychologists who teach statistics, but I ALWAYS show the ol' Yerkes-Dodson's graph when explaining that correlation ONLY detects linear relationships but not curvilinear relationships. You know...moderate arousal leads to peak performance. See below:
http://wikiofscience.wikidot.com/quasiscience:yerkes-dodson-law



https://twitter.com/CNN/status/1024990722028650497




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