I was thinking something along these lines too. I would guess that people who make these sorts of mistakes when they're in test mode might not make them in a re

I was thinking something along these lines too. I would guess that people who make these sorts of mistakes when they're in test mode might not make them in a real-life situation When you're taking a test, you have the expectation that the problem was designed by a human who wants you to demonstrate a particular piece of knowledge. You look for subtle clues in the words that point to which core problem was in the mind of the person who wrote the question. The experimental setup seems like it would catch out people who make the assumption that the problems were designed to test knowledge.