Logical ReasoningDifficulty: Hard

PT144 S2 Q16 Explanation

When surveyed about which party

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

TopicsFlaw

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Stimulus

When surveyed about which party they would like to see in the legislature, 40 percent of respondents said Conservative, 20 percent said Moderate, and 40 percent said Liberal. If the survey results are reliable, we can conclude that most citizens would like to Conservative, 20 percent Moderate, and 40 percent Liberal.

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
16.

Which one of the following most accurately describes a flaw in the reasoning

Answer choices

  1. Not Actual vs. Desirable3% picked this

    The argument uses premises about the actual state of affairs to draw a conclusion about

    Because this answer says, "The argument uses premises about X to draw a conclusion about Y", we can just ask ourselves if X matches the evidence and Y the conclusion. Do the premises discuss the actual state of affairs? Kind of. Not a great match, but the actual survey results were 40/20/40. Does the conclusion talk about how things should be? Not at all. Definitely eliminate because of that mismatch.

  2. Not Circular11% picked this

    The argument draws a conclusion that merely restates a premise presented in

    This is not the famous circular reasoning flaw. The conclusion is saying, "most citizens want a legislature that is 40/20/40, Conservative/Moderate/Liberal". The evidence involves the results of a survey addressing the question, "which party would you like to see in the legislature". Those are distinct claims, not restatements of each other.

  3. Correct69% picked this

    The argument takes for granted that the preferences of a group as a whole are the preferences of most

    Why this is right

    Since the answer says, "the argument takes for granted that X is Y", we can ask ourselves whether X matches the evidence and Y the conclusion. Was the evidence talking about the preferences of a group as a whole? Sure if we were to say, "as a whole, the group of people surveyed, had preferences of 40% con, 20% mod, 40% lib." Does the conclusion talk about the preferences of most individual members of the group? Yes, although this gets complicated. The conclusion is saying that most citizens have a preference for 40% con, 20% mod, 40% lib. But the group the evidence was talking about was the surveyed group. This conclusion is talking about a different group — citizens in general. The reason we can equate those is because the author predicates this conclusion on the assumption that "the survey results are reliable", which means we can extrapolate from the results of the survey to the population at large that it represents. So the author sees that the group of survey respondents voted 40/20/40. Then she assumes that most individual survey respondents had a 40/20/40 preference. Then she stipulates that "if these results are reliable, then most citizens have a 40/20/40 preference."

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

  4. Doesn't Fail to Consider2% picked this

    The argument fails to consider that the survey results might have been influenced by the political biases of the

    The fact that the author stipulates, "if the survey results are reliable" means that she is considering that the survey results might not be reliable, for such reasons as bias on behalf of the researchers.

  5. Not Rough vs. Precise14% picked this

    The argument uses evidence that supports only rough estimates to draw a

    This is tempting, as the only other answer that sounds like it's saying, "Hey, author, you badly misinterpreted what that survey was saying." But our complaint isn't that the survey was only giving a fuzzy estimate and the author's conclusion is precisely quantified. Our objection is that "How did you possibly get the idea that most people want a legislature that is 40/20/40? Did anyone in the survey say that? That's not even a possible answer, given the survey's question — which party would you like to see in the legislature?" This answer is acting like the author was basically right, just over-precise. We're objecting that the author is nowhere close to being right. It's a total misunderstanding of what the survey was even measuring.

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