Logical ReasoningDifficulty: Easy

PT126 S4 Q25 Explanation

A study of 86 patients, all

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

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Stimulus

A study of 86 patients, all of whom suffered from disease T and received the same standard medical treatment, divided the patients into 2 equal groups. One group’s members all attended weekly support group meetings, but no one from the other group attended support group meetings. After 10 years, 41 meetings do not help patients with disease T live longer.

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
25.

Which one of the following statements, if true, most seriously weakens

Answer choices

  1. Weaker Impact7% picked this

    Of the 4 patients who survived more than 10 years, the 2 who had attended weekly support group meetings lived longer than

    This ain't nothing, but ain't much. It does help us argue that support group meetings are helping people live longer, but it only allows us to argue that when it comes to 4 of 86 data points. The correct answer applies to a wider swath of data points, so it has more impact.

  2. No Impact1% picked this

    For many diseases, attending weekly support group meetings is part of the

    We can tell from the logic of this paragraph that disease T is not among the many diseases for which weekly support group meetings is part of the standard medical treatment. After all, all 86 patients received the standard medical treatment for disease T, but only 43 of them attended weekly support meetings.

  3. Correct89% picked this

    The members of the group that attended weekly support group meetings lived 2 years longer, on average, than the

    Why this is right

    This helps us argue that "support group meetings do help patients with disease T live longer". After all, on average, the 43 patients who attended weekly support group meetings lived 2 years longer than the 43 patients who didn't attend weekly support group meetings! That's pretty compelling evidence (much stronger than what we get from choice A). Even though an equal number of patients in each group died, that doesn't mean that support group meetings made no difference. Apparently they made an "extra 2 years of life" difference!

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

  4. No Impact1% picked this

    Some physicians have argued that attending weekly support group meetings gives patients less faith in the standard treatment

    This is incredibly weak (some = at least one physician), and who cares whether it gives patients less faith in the standard treatment. We care about life span. Do the weekly support group meetings help them live longer? This answer doesn't address that concept.

  5. No Impact: cope vs. survive2% picked this

    Everyone in the group whose members attended weekly support group meetings reported after 1 year that those meetings had helped them

    The conclusion wasn't saying that support group meetings were worthless for patients with disease T. If it had, then we could weaken it by saying, "Sure it might not help you live longer, but it improves your qualify of life while you're alive. It helps you better cope with the illness." However, the conclusion is purely about whether or not these support group meetings help patients live longer, so this answer isn't speaking to what we care about.

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