Logical ReasoningDifficulty: Hard

PT131 S3 Q25 Explanation

Science writer: All scientists

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

TopicsNecessary Assumption

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Stimulus

Science writer: All scientists have beliefs and values that might slant their interpretations of the data from which they draw their conclusions. However, serious scientific papers are carefully reviewed by many other scientists before publication. These reviewers are likely to notice and object to biases that they scientific data will generally have been removed before publication.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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 is an assumption required by the science

Answer choices

  1. Not Required17% picked this

    The scientists reviewing serious scientific papers for publication do not always have biases likely to slant their interpretations of

    This would Strengthen the author's case, but it's not necessary. If we negate this, it says that the reviewers always have biases that slant their interpretations of the papers they're reviewing. That might sound damaging, but the author acknowledged in the first sentence that all scientists have beliefs/values that could bias them. So she might freely accept that all reviewers have biases that slant their review. However, she could still say that because you have many scientists reviewing these papers, even though they have their own biases, they are able to spot different biases held by those who wrote the papers. A team of biased reviewers, all calling out biases that they don't share with the writer could successfully weed out most/all biases from the paper. It's almost like if you have a team of politicians, with their own political biases, working together on a piece of legislation. Because they'll all call out the things that go too far afield of their own comfort zone, the resulting legislation should be pretty center of the road.

  2. Correct68% picked this

    In general, biases that slant interpretations of data in serious scientific papers being reviewed for publication are not

    Why this is right

    If we negate this one, it becomes a damaging objection: the biases that generally slant interpretations of data are shared among all scientists. Thus, a team of reviewers that all shared the same bias wouldn't notice or object to it, because they all share it. And that's how biases would make it through to the publication phase.

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

  3. Out of Scope: "scientific value"4% picked this

    Biases that are present in published scientific papers and shared by most scientists, including those who review the papers, are unlikely to impair

    The argument is only concerned with whether biases are weeded out or not by the pre-publication review phase. No part of the argument is concerned with whether or not the papers have scientific value.

  4. Too Strong: "the only part"3% picked this

    The interpretation of data is the only part of a serious scientific paper that is sometimes slanted by the

    The argument wouldn't care whether other parts of a paper are sometimes/never biased. The conclusion is only about whether the interpretations of data end up still being biased at the publication stage. This is a classic Necessary Assumption trap answer pattern: only one source of bias is mentioned, so they write a trap answer saying "it's the only source of bias".

  5. Too Strong: "only through peer review"8% picked this

    Slanted interpretations of data in a scientific paper can be removed only through careful review by scientists who do not share the biases of

    The author is assuming that peer review is sufficient weed out most biases, but she doesn't have to assume that peer review is necessary to weed out biases, as this answer says.

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