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Standard deviations in the text and in the caption of the figure 9.2 don't match
https://www.bayesrulesbook.com/chapter-9.html#building-the-regression-model
The text says that
In Figure 9.2, the right plot reflects a scenario with a relatively small value of σ=20.
and further
The opposite is true in the left plot which exhibits a larger σ=200.
However, the caption of the figure says that
Two simulated scenarios for the relationship between ridership and temperature, utilizing σ=2000 (left) and σ=200 (right).