Logical ReasoningDifficulty: Hard

PT155 S1 Q20 Explanation

Mr. Klemke argues that the complaints

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

TopicsFlaw

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Stimulus

Mr. Klemke argues that the complaints recently lodged against his roofing company are unfounded, on the grounds that each of the complainants disagrees with Klemke's widely known political views and is therefore biased. However, having a different political outlook from Klemke's would in no way prevent one then, the complaints are not, as Mr. Klemke alleges, unfounded.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

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

The question
20.

The argument against Mr. Klemke's allegation is flawed in

Answer choices

  1. Not Reverse Causality12% picked this

    takes a consequence of someone's being biased to be a cause

    This answer is saying that our author took the consequence/effect of something to be the cause of something. The nickname for that concept is Reverse Causality. An author might see a correlation between X and Y and conclude that X causes Y, while failing to consider that Y really caused X. In such an argument, we could say that the author "took a consequence of Y to be a cause of Y". But nothing in this argument has anything to do with causality, so this does not match anything.

  2. Correct65% picked this

    concludes that a claim is false on the grounds that an inadequate argument has been

    Why this is right

    This describes the famous Unproven vs. Proven False flaw. On earlier LSAT's, this flaw was easier to spot: "No one has ever proven that cell phones cause cancer. Thus, cell phones don't cause cancer". And the answer would say "Confuses an absence of evidence with evidence of absence". But on more modern tests, instead of saying "there's a lack of evidence for X", they like to do, "Someone made a crappy argument in favor of X". Their argument for X rested on a dubious assumption, or in this case made some illegal Ad Hominem move. But just because their reasoning was too faulty to prove X doesn't mean we have any grounds for assuming X is false. If we weren't familiar with this Top 10 famous flaw, then we would simply look at the form of this answer, Concludes X on the grounds that Y, and try to match X to the conclusion and Y to the evidence. Did the author conclude that a claim is false? Yes, "Mr. Klemke's allegation that the complaints are unfounded is false." Was the evidence talking about an inadequate argument being offered for the claim that the complaints are unfounded? Yes, it told us about how Klemke unsuccessfully tried to prove that the complaints were unfounded by pointing to political bias on the part of the complainants. Since everything matches, and since it describes an objectionable move, we can pick it.

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

  3. Not Ad Hominem14% picked this

    rejects an argument on the grounds that the person who offered the

    This answer describes the top 10 famous flaw, Ad Hominem, in which an author dismisses a point of view because the source is biased or has conflicting past behavior. Our author is trying to dismiss Klemke's view. Does she do so by citing a premise that "Klemke is biased?" No. Klemke committed this flaw in how he reasoned about the complainants. Our author didn't commit this flaw.

  4. Not Sampling2% picked this

    relies on a sample of opinions that is unlikely to represent

    This refers to the top 10 famous flaw Sampling, in which an argument relies on a sample of data points that we have reason to believe is too small, self-selecting, unrepresentative, biased, or otherwise problematic. This argument doesn't rely on a sample at all. Our author attempts to prove that Klemke's allegation is wrong by discussing Klemke's flawed way of dismissing the complaints.

  5. Not an Objection7% picked this

    overlooks the possibility that people whose views diverge are unaware of

    When a Flaw answer choice starts with fails to consider / overlooks the possibility, we can ask ourselves whether the idea that follows would potentially weaken the argument. Could we say, "Hey, author -- the complaints are unfounded. After all, people whose views diverge are unaware of their disagreement." That doesn't feel like it makes any sense. The complainants have view that widely diverge from Klemke's political views. Do we know or care whether the complainants are aware of that disagreement? We don't know and we don't care. That has more to do with Klemke's argument, whereas we're here to critique this author who is saying, "Since Klemke's reason for dismissing the complaints as unfounded was a dumb reason, the complaints must be well founded."

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