Logical ReasoningDifficulty: Hard

PT120 S4 Q19 Explanation

Fishing columnist: When an independent

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

TopicsFlaw

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Stimulus

Fishing columnist: When an independent research firm compared the five best-selling baits, it found that Benton baits work best for catching trout. It asked a dozen top anglers to try out the five best-selling baits as they fished for speckled trout in a pristine northern stream, and every angler had the most is the best bait for anyone who is fishing for trout.

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
19.

Each of the following describes a flaw in the reasoning in the fishing

Answer choices

  1. Valid Objection5% picked this

    The argument overlooks the possibility that some other bait is more successful than any of

    We only measured the top 5 sellers but then concluded that Benton is #1 among all baits.

  2. Valid Objection4% picked this

    The argument overlooks the possibility that what works best for expert anglers will not work

    We only measured what was best for top anglers but we're concluding Benton would be #1 for anyone.

  3. Valid Objection3% picked this

    The argument overlooks the possibility that the relative effectiveness of different baits changes when used

    We only measured how Benton performed in a pristine northern stream. Maybe if you're trout fishing in a turgid southern rivulet (just having fun with my mental thesaurus), it wouldn't work as well.

  4. Correct66% picked this

    The argument overlooks the possibility that two best-selling brands of bait may

    Why this is right

    Would it weaken the argument for us to say, "Hey, author, the two best-selling brands of bait are equally effective"? Not necessarily. We know that the author is arguing that Benton is the best, and we know that Benton is one of the top five best-selling brands. Is Benton #1? #4? #5? We don't know where it ranks in sales among the five best-selling brands. Let's say that it's the 3rd best selling bait. This answer is saying that the 1st and 2nd best selling baits are equally effective. That wouldn't weaken the author's argument at all. She isn't claiming that Benton is ranked #1 in terms of sales. She's saying Benton is #1 in terms of effectiveness. If the 1st and 2nd best selling baits are equally effective, that doesn't pose any problem for the author. They can be tied at a lower level of effectiveness. We know that anglers had the most success with Benton. Let's say they caught an average of 10 trout per hour and call that Benton bait's effectiveness. This answer is saying, "Hey, author, you're failing to consider that the two best selling brands are tied at an average of 7 trout caught per hour." That doesn't hurt the author's argument in any way, so we can't consider this overlooked possibility a flaw.

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

  5. Valid Objection22% picked this

    The argument overlooks the possibility that baits that work well with a particular variety of fish may not work well with

    We only measured how Benton performed with speckled trout, but maybe it doesn't do as well with other varieties of trout.

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