Logical ReasoningDifficulty: Medium

PT102 S3 Q7 Explanation

A commonly accepted myth is that

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

TopicsFlaw

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Stimulus

A commonly accepted myth is that left-handed people are more prone to cause accidents than are right-handed people. But this is, in fact, just a myth, as is indicated by the fact that more people than are caused by left-handed people.

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
7.

The reasoning is flawed because the

Answer choices

  1. Opposite, if anything4% picked this

    makes a distinction where there is no real difference between the

    We weren't complaining that the author made a distinction. We accept that right handedness is distinct from left handedness. We were actually complaining that the author made an equivalence when there is a real distinction between the things. She equated "accidents" with "household accidents". She equated "higher total number" with "higher propensity".

  2. Correct72% picked this

    takes no account of the relative frequency of left-handed people in the population

    Why this is right

    This speaks to the objection of, "Naturally, there are more accidents caused by right handed people; there are like 8 times as many right handed people in the world as left handed people." It also speaks to the objection of even citing raw numbers in the evidence when the conclusion is about how prone / how likely a certain group is, so we would never measure that in raw numbers. We would always measure it in relation to the relative size of the underlying population.

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

  3. Wrong Flaw11% picked this

    uses the word “accidents” in two

    This answer refers to the famous flaw Equivocation, in which the author uses the same term or concept in two very different ways. For example, if we had used accident at one point to describe a kid peeing their pants and later we were using accident to mean a car wreck. This argument uses accident consistently; it just concludes something about all accidents while only providing evidence about a subset, household accidents.

  4. Not an Objection3% picked this

    ignores the possibility that some household accidents are caused by more

    Does it weaken the argument if we say, "at least one household accident is caused by more than one person"? No, that's such a puny one-data-point type of objection.

  5. Too Strong: wholly irrelevant10% picked this

    gives wholly irrelevant evidence and simply disparages an opposing position by calling

    The evidence is not wholly irrelevant. It's certainly incomplete, but it could be relevant. Household accidents are part of "accidents", so it's part of the story we're analyzing in the conclusion.

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