In the explanation for this question, J.Y mentions that there are several other flaw questions where the flaw is that they say that a correlation between A and B, and a correlation between A and C, means that B and C are correlated. The example he uses that's much clearer than what they're using in this question is that there's a correlation between being a motorist and wearing a seatbelt, and there's a correlation between being a motorist and sustaining an injury in a motor vehicle accident, but that does not mean that there is a correlation between wearing a seatbelt and sustaining an injusry in a motor vehicle accident.
Anyway, he said that there are other questions like this one, but never said which ones they are. Does anyone know of others or any ideas on how I'd find more like this? Thanks!
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I think you're looking for questions that involve overlapping (or non-overlapping) parts of the same whole. You see these in the positive and in the negative on the LSAT. In the positive: if you have two majorities in the same whole, those two majorities must at least overlap some. If you have two less-than-majorities of the same whole, they don't have to overlap.
So, If most hound dogs are happy and most hound dogs are sulky, there is at least one happy, sulky hound dog out there. But, if it's some hound dogs are happy and some hound dogs are sulky, the sulky hounds need not overlap with the happy ones.
You see this flaw again in PT124.S2.Q20.