Logical ReasoningDifficulty: Hard

PT115 S2 Q20 Explanation

Productivity is average output per worker

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

TopicsFlaw

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Stimulus

Productivity is average output per worker per unit of time. High productivity cannot be achieved without adequate training of workers. So high on having high-tech equipment.

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
20.

The reasoning in the argument is most vulnerable to criticism on the grounds

Answer choices

  1. Wrong Claim Targeted5% picked this

    confuses a stated requirement for having high-tech equipment with a sufficient condition for

    When the authors commit a Necessary vs. Sufficient error, as our author did here, it's common to see a trap answer that uses that kind of language, but applies it to the wrong conditional. For example, if I argued this: Since A ? B and A ? C Clearly, B ? C Did I mess up the 1st conditional or the 2nd one? When we look at the conclusion, is it wrong to have B on the left side of the arrow or to have C on the right side? The first conditional is bad. The author is thinking she has these two premises: Since A ? B B ? A and A ? C Clearly, B ? C In this argument, the author messed up the conditional in the 2nd sentence. It says that "High productivity requires adequate training", but the author's conclusion is acting like it said "Adequate training is sufficient to provide high productivity". So if this answer said "confuses a stated requirement for high productivity, rather than high-tech equipment", it would be correct.

  2. Correct71% picked this

    ignores the possibility that having high-tech equipment is required for adequate

    Why this is right

    When Flaw answers start with fails to consider / ignores the possibility we can ask ourselves, "If true, would this idea be an objection to the argument?" Would it weaken this argument if we said that "adequate training requires high-tech equipment"? Sure! The author told us that high productivity requires adequate training. If we tell him that adequate training requires high-tech equipment, then we can all infer that high productivity requires high-tech equipment. That would contradict the conclusion! It's important that we understand how to "try this answer on for size". This wouldn't have been language anyone would have predicted or been looking for, because there were far less exotic ways to object to the argument. We shouldn't feel at all guilty for not having predicted this specific objection. But this satisfies both our prerequisites for a correct Flaw answer: 1. it is descriptively true 2. it points to a problem with the logic

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

  3. Not an Objection0% picked this

    overlooks the fact that increases in productivity may not be desirable

    When Flaw answers start with fails to consider / overlooks the possibility we can ask ourselves, "If true, would this idea be an objection to the argument?" Would it weaken this argument if we said that "in some circumstances, an increase in productivity might not be desirable"? No, it couldn't. We're only assessing whether or not high-tech equipment is required for high productivity. We're not assessing whether high productivity is a good thing or bad thing, whether it's desirable or undesirable.

  4. Not Assumed / Too Strong: always2% picked this

    presumes without giving justification that educating workers always results in an increase

    When Flaw answers start with presumes / takes for granted / fails to establish we can ask ourselves, "did the author need to assume this idea?" If we had read this argument on Necessary Assumption, would we have said the author is assuming that "educating workers always results in an increase in their productivity"? That's very strong. Tons of Flaw answer choices are wrong because they accuse the author of assuming some really strong idea. To be honest, this could get tempting, because the author was treating the 2nd sentence as a sufficient idea: Adequate Training ? High Productivity. And this answer is almost saying that the author is assuming that conditional. But both the trigger and the outcome here are slightly different ideas: Educating Workers ? Increase in Productivity

  5. Not Assumed / Too Strong: cannot22% picked this

    presumes without giving justification that high-tech equipment cannot contribute to increases

    When Flaw answers start with presumes / takes for granted / fails to establish we can ask ourselves, "did the author need to assume this idea?" If we had read this argument on Necessary Assumption, would we have said the author is assuming that "high-tech equipment can never contribute to increases in productivity"? No, that's very strong. Tons of Flaw answer choices are wrong because they accuse the author of assuming some really strong idea like this. The author was saying that high-tech equipment isn't required for high productivity; she wasn't saying it was value-less. I can say "Getting into Harvard does not depend on having a 180 LSAT", but that doesn't mean I believe "getting a 180 on your LSAT cannot contribute to increasing your likelihood of being admitted to Harvard".

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