Logical ReasoningDifficulty: Medium

PT143 S3 Q15 Explanation

Ninety percent of recent car buyers

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

TopicsSufficient Assumption

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Stimulus

Ninety percent of recent car buyers say safety was an important factor in their purchase. Yet of these car buyers, only half consulted objective sources of vehicle safety information before making their purchase; the others relied on advertisements and promotional in saying that safety was important to them.

What this question is testing

Sufficient Assumption

Your task

Find the assumption that, if added, guarantees the conclusion follows.

Common trap

Answers that only partly bridge the gap, leaving the conclusion unproven.

Winning move

Identify the new term in the conclusion and pick the choice that links it to the evidence.

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

The question
15.

The argument's conclusion follows logically if which one of the following

Answer choices

  1. Too Weak Bad Conclusion Match3% picked this

    Someone who claims that safety was an important factor in a buying decision does not necessarily mean that safety

    We're almost never going to pick weakly worded answers on Sufficient Assumption, Strengthen, Weaken, or Paradox. We need to prove beyond the shadow of a doubt that "safety was not important". This answer is saying, "Safety wasn't necessarily the most important".

  2. Unrelated to Goal7% picked this

    Advertisements and promotional materials sometimes provide incomplete vehicle

    We're trying to prove that "safety was not important", and the evidence didn't provide any such rule like "If xyz is true, then safety is not important" that would allow us to derive such a conclusion. So the correct answer must be that sort of rule, and this answer doesn't even have language like whether "safety was important".

  3. Unrelated to Goal1% picked this

    Recent car buyers do not necessarily tell the truth when asked about the factors that contributed

    We're trying to prove that "safety was not important", and this answer doesn't even have language like whether "safety was important", so there's no way to combine it with our evidence and derive the language "safety was not important".

  4. Unrelated to Goal12% picked this

    Most consumers are aware that advertisements and promotional materials are not objective sources of

    We're trying to prove that "safety was not important", and this answer doesn't even have language like whether "safety was important", so there's no way to combine it with our evidence and derive the language "safety was not important".

  5. Correct78% picked this

    Anyone to whom safety is an important factor in purchasing a car will consult an objective source of

    Why this is right

    This is the only answer choice that provides a rule (i.e. a proving mechanism) that outputs the language of the conclusion: safety was not an important factor. Like many, if not most, correct answers on Sufficient Assumption, it's written in contrapositive form. If safety is an important ? then consult an factor in purchasing car objective source The contrapositive will put our conclusion language on the right side of the arrow, where we need it. If didn't consult ? safety was not imp an objective source factor in buying car We know "these other buyers" didn't consult an objective source of vehicle safety info before making their purchase (they just relied on ads and promo materials), and so according to this rule we can logically derive that "safety was not an important factor to them".

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

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