Logical ReasoningDifficulty: Medium

PT7 S1 Q10 Explanation

A large group of hyperactive children

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

TopicsFlaw

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Stimulus

A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent can be concluded that food additives can contribute to behavior problems in hyperactive children.

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
10.

The evidence cited fails to establish the

Answer choices

  1. Trap11% picked this

    there is no evidence that the reduction in behavior problems was proportionate to the reduction

  2. Correct77% picked this

    there is no way to know what changes would have occurred without the change of diet, since only children who changed to

    Why this is right

    Answer B is correct.

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

  3. Trap3% picked this

    exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group

  4. Trap3% picked this

    there is no evidence that the behavior of some of the children was

  5. Trap6% picked this

    the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than

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