Logical ReasoningDifficulty: Easy

PT126 S3 Q9 Explanation

Among people who have

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

TopicsWeaken

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Stimulus

Among people who have a history of chronic trouble falling asleep, some rely only on sleeping pills to help them fall asleep, and others practice behavior modification techniques and do not take sleeping pills. Those who rely only on behavior modification fall asleep more quickly than do those who rely only than are sleeping pills in helping people to fall asleep.

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
9.

Which one of the following, if true, most weakens

Answer choices

  1. Out of Scope6% picked this

    People who do not take sleeping pills spend at least as many total hours asleep each night as do the

    Staying asleep is not relevant, since this argument is about how difficult it is to fall asleep.

  2. Too Weak3% picked this

    Most people who have trouble falling asleep and who use behavior modification techniques fall asleep more slowly than do most people who

    That behavior modification techniques are better at helping people fall asleep than sleeping pills does not imply that behavior modification techniques are better at helping people fall asleep that have no trouble falling asleep.

  3. Supports a Premise6% picked this

    Many people who use only behavior modification techniques to help them fall asleep have never

    This supports the premise that some people only use sleeping pills to help them fall asleep, while others use on behavior modification techniques.

  4. Correct82% picked this

    The people who are the most likely to take sleeping pills rather than practice behavior modification techniques are those who have previously

    Why this is right

    This undermines the argument by suggesting those who tried modifying their behavior generally had less difficulty falling asleep. This makes it possible for sleeping pills to be more effective at helping people fall asleep, but that the people who take such pills already begin with a much more difficult time falling asleep.

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

  5. Out of Scope2% picked this

    The people who are the most likely to practice behavior modification techniques rather than take sleeping pills are those who prefer not to use

    The preference to not use drugs is not relevant to the effectiveness of those drugs.

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