Logical ReasoningDifficulty: Easy

PT134 S1 Q4 Explanation

Physician: In an experiment

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

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Stimulus

Physician: In an experiment, 50 patients with chronic back pain were divided into two groups. Small magnets were applied to the backs of one group; the other group received no treatment. Most of the patients in the first group, but very few in the second group, reported magnetic fields are probably effective at relieving some back pain.

What this question is testing

Weaken

Your task

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

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines 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, constitutes the logically strongest counter to

Answer choices

  1. Correct90% picked this

    A patient's merely knowing that a treatment has been applied can lead to improvement in

    Why this is right

    This provides an alternative cause for the back pain relief other than the magnetic field treatments.

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

  2. Too Weak1% picked this

    Most physicians believe that medication relieves chronic back pain more effectively

    This makes magnets less effective than medication, but that does not mean that magnets are not effective.

  3. Out of Scope1% picked this

    No other experiments have been done showing that magnetic fields reduce pain in any area

    Pain in areas other than the back is not relevant to this argument.

  4. Strengthen1% picked this

    Some of the scientists who helped design the experiment believed even before the experiment that magnetic fields relieve back pain, but they were not

    This makes it more likely that magnets are probably effective at relieving some back pain.

  5. Out of Scope6% picked this

    There was wide variation in the specific causes of the chronic back pain suffered by the

    What caused the chronic back pain is less important than what relieved the back pain in this experiment.

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