I think you’re correct that P(Z=0) is 1⁄10 -- the author seems to have been calculating the odds ratio instead of the probability. (In fact, they correctly say that P(Z=0) is 1⁄10 later on in the post).
Fixed, thanks!
I think you’re correct that P(Z=0) is 1⁄10 -- the author seems to have been calculating the odds ratio instead of the probability. (In fact, they correctly say that P(Z=0) is 1⁄10 later on in the post).
Fixed, thanks!