The previous m4_3b model resulted in a negative $\beta$-value which isn't consistent with what's in Prof. McElreath's "Statistical Rethinking" textbook. I've written a line of code to properly generate a log-normal distribution for the $\beta$-value so that it results in a positive value (i.e. roughly 0.902) when you return the summary table for trace_4_3b. I'm planning to submit more PR's as I read through the text so any good feedback for my first PR would be helpful!

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pymc-devs / pymc-resources

Fixed an issue with `m4_3b` model which returned a negative b-value not consistent with output from textbook #230

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