Also, remember that we can't weaken a valid argument. If the conclusion is properly drawn, it is impossible to weaken it without changing the premises. So even before we weaken it, the question type has already precluded validity!
I also wonder. But the data about LSAT being a better indicator is from LSAC, who might, just might, have a vested interest in the LSAT being a valid predictor.
I haven't. I just finished reviewing the valid and invalid argument types and I was more confused on how it would be presented as a question if that makes sense. But that gave me a better understanding on how it would be shown.
... colloquial definition of what a valid argument actually means and how ... . I used to view the valid/invalid arguments with a similar ... of confusion.