Logical ReasoningDifficulty: Medium

PT140 S3 Q4 Explanation

The Magno-Blanket is probably able

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsStrengthen

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Stimulus

The Magno-Blanket is probably able to relieve arthritic pain in older dogs. A hospital study of people suffering from severe joint pain found that 76 percent of those who were treated with magnets reported reduced pain after just 3 weeks. Dogs and humans have similar physiologies and the Magno-Blanket brings as they were to patients' joints in the hospital study.

What this question is testing

Strengthen

Your task

Find the choice that makes the argument's conclusion more likely to be true.

Common trap

Answers that are consistent with the argument but add no real support, or that strengthen a claim the argument doesn't make.

Winning move

Locate the gap between evidence and conclusion, then pick the choice that closes it.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
4.

Which one of the following, if true, most strengthens

Answer choices

  1. If-Conclusion6% picked this

    The Magno-Blanket is likely to be effective on cats and other pets as well if it is effective at reducing

    This answer choice says, "If (it turns out that) Magno-Blanket would effectively reduce joint pain in arthritic dogs, then we would know _____ ." We're trying to figure out IF that idea is true. We don't care what comes next or what would follow from that. Any time a strengthening type answer choice says "If [conclusion is true]" it's wrong. Any time a weakening type answer choice says "Even if [conclusion is true]", it's wrong. These arguments are about litigating the truth of the conclusion. These types of answer choices are part of some other trial, since they're outside of the issue of whether the conclusion is true.

  2. Weakens10% picked this

    Magnets have been shown to be capable of intensifying the transmission of messages from people's nerve

    This undermines the plausibility that magnets cause pain relief. When we're feeling pain from some area, nerves from that area are sending "pain" messages back to our brains. If magnets intensify that transmission, then magnets would intensify the feeling of pain.

  3. No Impact5% picked this

    There are currently fewer means of safely alleviating arthritic pain in dogs

    We're trying to figure out whether Magno Blankets is a means of safely alleviating arthritic pain in dogs. Whether there are 20 other available means of alleviating joint pain in dogs, or whether there are 1000 other or 0 other means is irrelevant. How many ladders I currently do / don't own (or whether I have more/fewer ladders than my neighbor) is irrelevant when it comes to assessing whether THIS ladder is a viable ladder for accomplishing a certain task.

  4. Weakens, if anything5% picked this

    The patients in the hospital study suffering from severe joint pain who, after being treated with magnets, did not report reduced pain tended not

    This idea is a mouthful, so let's take it in bite-sized pieces. Let's just pause with this much: patients w/ severe pain who got treated with magnets and didn't report reduced pain (i.e. reported they still had as much pain). Do they have any impact or relevance to this conversation? Yes. In fact their existence kind of weakens the argument that magnets caused pain relief in the hospital study. Now, if you were defending the idea that magnets did indeed cause pain relief, in the hospital study, you might make an excuse for these counterexample patients, and say, "Yes, some people didn't report pain relief, but that's just because they were the patients suffering from the most severe pain." That would be a way to protect the argument against an objection (which would mildly strengthen). But this answer actually says that the ones who felt no pain relief from the magnets weren't the worst suffering people. At its best, this answer choice would be making an excuse for the people who got treated with magnets but didn't report pain relief, so even if we re-wrote it to "fix" it, it would still just be trying to limit the damage of a weakening idea (make an excuse for counterexamples in which magnets didn't lead to reports of pain relief).

  5. Correct74% picked this

    Most of the patients in the hospital study suffering from severe joint pain who received a placebo rather than treatment with magnets

    Why this is right

    The most common form of correct answer on Strengthen, when the argument is making some Cause/Effect assumption is to show us data points that say, "things not exposed to the supposed Cause did not experience the supposed effect." (i.e. the Control Group in a science experiment) That's what this answer choice is doing. It's increasing the plausibility that the Magno Blanket treatment genuinely helped reduce the joint pain, by ruling out the placebo effect and ruling out the idea that their pain just improved on its own over the course of 3 weeks. If people who didn't get the magnet treatment didn't report less pain, then that makes it more plausible that magnets really were the causal difference-maker that led to pain relief.

    Skill tested: Strengthen · how this choice captures the argument's function is the move to repeat next time.

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