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Feedback on Resources: The magic number 30
umakegoodcookies Aug 08, 2016 ReplyFlag
I'm a bit torn about teaching my students 30 is some sort of magic number. I'd love to hear thoughts about the justification of that throughout the textbook.
David Aug 08, 2016 ReplyFlag
I wouldn't call it a magic number, just a rule of thumb. Rules of thumb always break down, and this is discussed in Section 4.4 of OpenIntro Statistics.

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