Logical ReasoningDifficulty: Easy

PT8 S4 Q1 Explanation

The cafeteria at Acme Company

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

TopicsFlaw

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Stimulus

The cafeteria at Acme Company can offer only four main dishes at lunchtime, and the same four choices have been offered for years. Recently mushroom casserole was offered in place of one of the other main dishes for two days, during which more people chose mushroom casserole than any other main dish. one of the regular dishes as a permanent part of the menu.

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
1.

The argument is most vulnerable to criticism on the grounds that it

Answer choices

  1. No Impact (Irrelevant Comparison)2% picked this

    the proportion of Acme Company employees who regularly eat lunch in

    The proportion of employees who eat in the cafeteria regularly would not directly address whether people genuinely prefer mushroom casserole over other dishes permanently. The conclusion is only about the people who do eat in the cafeteria, so it doesn't matter whether that's a large or small % of employees.

  2. No Impact (Irrelevant Comparison)2% picked this

    whether any of the ingredients used in the cafeteria’s recipe for mushroom casserole are included in any of

    This doesn't give us a way to argue that people would be displeased if mushroom casserole became a permanent fixture of the menu. Whether we say, "yes there are some ingredients in common between the mushroom casserole and some of the other main dishes; for example, they both have salt and garlic" or whether we say "no, there are no ingredients in common" doesn't give us any insight into whether people actually liked the flavor of the mushroom casserole or would want it on a regular, ongoing basis.

  3. Correct93% picked this

    a desire for variety as a reason for people’s choice of mushroom casserole during the

    Why this is right

    If we say "people chose to eat the mushroom casserole because they desired something new (rather than the same four choices for years on end)", that offers an alternate explanation for why it was popular over its two day run. It wasn't because it was everybody's favorite dish, but merely because they felt like trying something different. This doesn't establish that people would be displeased if it became a permanent menu item, but it undermines the author's assumption that its two day reign as the most popular item signals that people loved it.

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

  4. No Impact (Irrelevant Quality)2% picked this

    what foods other than main dishes are regularly offered at lunchtime

    What foods other than the main dishes are offered doesn't impact the argument about replacing a main dish with mushroom casserole. There's no common sense link that would allow us to say something like, "If a salad bar is also offered, then people would / wouldn't want mushroom casserole as one of the four permanent dishes."

  5. No Impact (Out of Scope)1% picked this

    whether other meals besides lunch are served in the Acme

    Whether or not other meals besides lunch are served in the cafeteria doesn't address whether mushroom casserole should replace a regular dish for lunchtime. The idea that the cafeteria might also serve breakfast or dinner doesn't give us any insight as to whether people would want mushroom casserole to be one of the four permanent lunch choices.

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