QUESTION TYPE: Argument Evaluation
CONCLUSION: Decaf coffee damages connective tissues.
REASONING: The decaf group had worse connective tissues than the caffeinated group.
ANALYSIS: There was no control group in this study. One group drank decaf, the other caffeinated coffee. A control group would drink no coffee at all.
It’s possible that decaf damages connective tissues. It’s also possible that decaf does no damage, and caffeinated coffee helps connective tissues. That could also account for the gap.
The wrong answers all talk about the population in general. We only care about these two groups. Each group drank three cups per day.
It doesn’t matter what other coffee drinkers do – they weren’t part of the group.
- This doesn’t matter. We don’t know if exercise helps or hurts joints. We also don’t know whether this specific group of decaf drinkers exercised. We care about this particular group, not decaf drinkers in general.
- We don’t care what people do in general. We only care about these two groups. They each drank three cups per day.
- CORRECT. This is very relevant. If caffeine slows connective tissue degeneration, they maybe coffee helped the group that drank it. The decaf group didn’t hurt themselves, they just didn’t help themselves by drinking caffeine.
- Same as A and B. We only care about these two groups, not coffee drinkers in general.
- Same as all the other wrong answers. We only care about the two groups, not the general population.
Need help with LR? → Sign up hereTry the LSAT Hacks Course
Graeme teaches how to break down arguments, quickly