Logical Reasoning

PT158 · S4 · Q26 Every Labrador retriever in my

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Every Labrador retriever in my neighborhood is a well-behaved dog.

Evidence

Every Lab in my neighborhood X → Y is a well-behaved dog.

Being well behaved requires Y → Z that it was trained.

Conclusion

It is training that accounts for Z causes Y, well-behaved, not Lab breed not X*

Evaluate

Because there are Conditionals / Quantifiers like "Every" and "No", it makes sense to think about diagramming this argument somewhat algebraically.

Also, there are overlapping ideas (well-behaved is in all three claims / training is in two / Labrador is in two), which also argues in favor of an algebraic approach.

Given our strong structural recipe, we might be able to find the correct answer just by matching up those parts. But sometimes we need to think more about why we're objecting to this logic.

How could we argue with the Conclusion?

We know that training is relevant to being well-behaved, since it's identified as a necessary characteristic. But couldn't the DNA of a Labrador also play a role? Maybe the author's conclusion is just messed up because she's saying, "THIS is the cause, not THAT", when we might object, "couldn't they both be causal factors?"

Goal

Look for an answer with this structure: P1: Every X is Y P2: Y requires Z Conc: Y is due to Z, not to X

Or look for an answer whose conclusion is vulnerable to the same type of conversational objection, "couldn't both of them be involved"?

26.

The flawed reasoning in which one of the following is most closely parallel to the flawed reasoning in the argument above?

  1. All the students at Bryker

    Different Conclusion Type

    This argument's conclusion is a prescriptive recommendation: all schools should hire good teachers. The original's conclusion is explanatory: training, not genetics, explains good behavior. For a parallel flaw, the conclusion types must match. The original wrongly eliminates an alternative cause by pointing to a necessary condition. This answer makes a universal recommendation about what schools should do -- a different type of reasoning error. An explanatory conclusion that dismisses an alternative cause is structurally different from a prescriptive recommendation, even if both involve some notion of necessary conditions.

    18% picked this

  2. Correct

    Whenever it snows there are

    Why this is right

    This answer perfectly mirrors the original's structure and flaw. The original: all neighborhood Labs are well-behaved, no pet is well-behaved without training, therefore training -- not genetics -- explains the behavior. This answer: snowy days have more car crashes, no crash occurs without driver carelessness, therefore carelessness -- not icy roads -- explains the crashes. Both commit the identical error: identifying a necessary condition (training / carelessness) and using it to exclude an alternative contributing factor (genetics / icy roads) as the explanation for an observed phenomenon. But a necessary condition can coexist with other causes. Carelessness might be necessary for crashes AND icy roads might also contribute. Training might be necessary for good behavior AND genetics might also help. Both arguments wrongly elevate necessity to exclusive causation.

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

    54% picked this

  3. Every musician I know is

    Different Flaw Structure

    This argument draws connections between musical ability and dance, and between mathematical ability and counting, in a way that involves faulty analogies between domains. The reasoning error here concerns improper category mapping -- conflating distinct types of skills and drawing unsupported connections between them. The original's specific flaw is different: it identifies a necessary condition and uses it to exclude an alternative cause. This answer lacks the clear "nothing happens without X, therefore X alone explains it" structure that characterizes the original. The premises do not include a necessary condition claim that parallels "no pet is well-behaved without training."

    18% picked this

  4. All of the good cooks

    Missing Alternative-Cause Dismissal

    This argument has a simpler structure: good cooks use butter, therefore you should use butter to cook well. It generalizes from a correlation to a recommendation. Crucially, there is no competing explanation being dismissed. The original says "it is training, NOT genetics." This answer does not say "it is butter, NOT skill" or "it is butter, NOT fresh ingredients." Without that explicit dismissal of an alternative factor, the argument lacks the signature element of the original's flaw. The original's error is specifically about pitting two potential causes against each other and wrongly declaring one the winner based on necessity alone. This answer does not create that two-factor competition.

    5% picked this

  5. All of the students in

    Different Flaw Type

    This argument highlights a disconnect between students' grades (they got A's) and their actual abilities (they cannot solve word problems), then concludes they did not do good work. The reasoning error concerns measurement validity -- whether grades accurately reflect competence. The original's flaw is entirely different: it identifies a necessary condition, uses it to conclude that this condition is the sole explanation, and dismisses an alternative factor. This answer does not feature competing explanations for an outcome, a necessary condition claim, or the dismissal of an alternative cause. It operates in a different logical territory from the original.

    6% picked this

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