Comments (3)
This confusion come from the difference between Population Standard Variance and Sample Standard Variance.
In the book, Shiffman is using Sample Standard Variance (254.23). However the 228.81 comes from Population Standard Variance.
I found this article to be very helpful in describing the difference: click here
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Looks like this issue was corrected as a part of #65 🙂
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Thanks everyone for the comments! Closing this issue, feel free to flag it in noc-book-2
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