Logical ReasoningDifficulty: Easy

PT131 S1 Q4 Explanation

Advertisement: Seventy-five percent of dermatologists

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

TopicsFlaw

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Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Advertisement: Seventy-five percent of dermatologists surveyed prefer Dermactin to all other brands of skin cream. Why? We consulted dermatologists during the development of Dermactin to ensure that you have the best skin cream need a skin cream, use Dermactin.

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
4.

The reasoning in the advertisement is questionable because

Answer choices

  1. Out of Scope - Opposite Group7% picked this

    overlooks the possibility that other types of doctors have cause to use Dermactin, which would

    Doctors who are not dermatologists are not relevant to the argument since the conclusion is narrowly drawn around those who need a skin cream.

  2. Correct85% picked this

    fails to state the number of dermatologists surveyed, which leaves open the possibility that the sample of doctors is

    Why this is right

    This points out the possibility that the dermatologists surveyed held more positive views about Dermactin than dermatologists more generally.

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

  3. Contradiction3% picked this

    presumes, without providing justification, that some dermatologists are less qualified than others to

    The argument assumes that all dermatologists are equally qualified to evaluate skin cream.

  4. Contradiction4% picked this

    relies on an inappropriate appeal to the opinions of consumers with no special knowledge

    The appeal was to the opinion of dermatologists, not consumers.

  5. Out of Scope - Opposite Group2% picked this

    overlooks the possibility that for a few people, using no skin cream is preferable to using even

    The argument is about people who need skin cream. People who do not need skin cream are not relevant to the argument.

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