Logical ReasoningDifficulty: Medium

PT144 S3 Q15 Explanation

Advertisement: In a carefully controlled

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

TopicsFlaw

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Stimulus

Advertisement: In a carefully controlled study, blindfolded volunteers were divided evenly into five groups. Each volunteer tasted Sparkle Cola and one of five competing colas, each group tasting a different cola. Most of the volunteers said they preferred Sparkle Cola to the competing cola tasted. This shows from consumers than any of the competing colas tested.

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
15.

The reasoning in the advertisement is most vulnerable to criticism on which one of

Answer choices

  1. Correct72% picked this

    It overlooks the possibility that a generalization true of the entire group of volunteers was not true of each

    Why this is right

    Since this starts with fails to consider / overlooks the possibility, we're trying to judge whether we could use the idea that follows to object to the argument. If there is a generalization true of the entire group, most people picked Sparkle over the competing cola that isn't true for at least one of the smaller groups, in the smaller group that measured Sparkle vs. Soda X, it was not true that most people picked Sparkle over the competing soda. then even though most people picked Sparkle, we still wouldn't say that Sparkle elicited a better response than all the colas tested, since Soda X elicited a better response than Sparkle. This speaks strongly to why it's so important to figure out a problem with the argument before looking at answers, since it can be near impossible to figure out what LSAC is going for with some of these answers if you don't already have the "right idea" in your brain.

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

  2. Not Assumed: most2% picked this

    It takes for granted that most of the volunteers would buy Sparkle Cola rather than one of the other colas tasted, at least in

    Since this starts with takes for granted / presumes, we can ask ourselves whether the author needed to assume the idea that follows. No the author doesn't have to assume "at least 51% of the volunteers would buy Sparkle". The conclusion has nothing to do with buying and doesn't make any predictions about consumer behavior. If we negated this assumption and said, "No, author, at most 49% of volunteers would buy it when it's not much more expensive", that would hurt this argument. This is only about which soda elicited the most favorable response in a blind taste test, not at all about whether consumers who participated have now had their shopping habits change going forward.

  3. Out of Scope Objection: not tested18% picked this

    It overlooks the possibility that some cola not tested in the study would have elicited a more favorable

    Since this starts with fails to consider / overlooks the possibility, we're trying to judge whether we could use the idea that follows to object to the argument. But we can't object by talking about colas not tested in the study. The conclusion is only about comparing Sparkle to the other colas that were tested.

  4. Out of Scope Objection6% picked this

    It overlooks the possibility that many people may prefer Sparkle Cola to competing colas for reasons such as the packaging or price of

    Since this starts with fails to consider / overlooks the possibility, we're trying to judge whether we could use the idea that follows to object to the argument. Does it hurt the author's argument if we say, "a lot of people prefer Sparkle because of its packing or price, not its taste"? No. First of all, in the study, it was a blind taste test and they didn't have to pay for their sodas, so both packaging and and price are impossible reasons for why the volunteers preferred Sparkle. Secondly, the author's conclusion is not specifically about preferring Sparkle's taste. It's just about Sparkle eliciting a more favorable response, so it only helps the author if we say that many people prefer Sparkle's packaging, or its price. The author doesn't specifically care why it elicits a more favorable response. As long as it elicits a more favorable response, the author's conclusion is still a true statement.

  5. Not a Complaint About Logic1% picked this

    It is based on a study that does not elicit consumers' responses to any beverages

    It is true that this argument is based on a study that only elicited responses to colas, but so what? That's not a logical problem with the argument. Both the evidence and the conclusion are only about comparing responses to colas, so the argument's scope stays consistent as it moves from premise to conclusion (which is a good thing).

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