Logical ReasoningDifficulty: Easy

PT103 S1 Q6 Explanation

Videocassette recorders (VCRs)

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

TopicsFlaw

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Stimulus

Videocassette recorders (VCRs) enable people to watch movies at home on videotape. People who own VCRs go to movie theaters more often than do people who do not own VCRs. Contrary to popular belief, therefore, owning a VCR theaters more often than they otherwise would.

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
6.

The argument is most vulnerable to criticism on the grounds

Answer choices

  1. Wrong Flaw2% picked this

    concludes that a claim must be false because of the mere absence of evidence

    This describes the famous Unproven vs. Proven False flaw, in which an author rebuts someone and instead of saying, "You failed to prove X", they go too far and say, "X is apparently false". This has no bearing whatsoever on this conversation. There isn't any opponent being rebutted. The argument does not conclude that a claim must be false, so that first mismatch is enough to bail from this.

  2. Wrong Flaw2% picked this

    cites, in support of the conclusion, evidence that is inconsistent with other information

    This describes the famous Self-Contradiction flaw, in which an author says something early on that contradicts something they say later. "Inconsistent" = contradictory Do any of these premises contradict each other? There's only two claims: - VCRs enable people to watch movies at home - People who own VCRs go to movie theaters more often than do people without VCRs Those claims do not contradict each other.

  3. Correct79% picked this

    fails to establish that the phenomena interpreted as cause and effect are not both direct effects

    Why this is right

    This is one version of the famous Causal flaw (fails to consider 3rd factor). This is saying that the author fails to consider that we could explain this correlation between VCR ownership and going to the movies a different way. Rather than "going to movie theaters" being stimulated by "owning a VCR", it's possible that "owning a VCR" and "going to movie theaters more often" are both direct effects of some other factor ... being wealthy or being a fan of movies.

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

  4. Wrong Flaw10% picked this

    takes a condition that by itself guarantees the occurrence of a certain phenomenon to be a condition that therefore must be met

    This describes the famous Necessary vs. Sufficient flaw, in which an author presents a conditional logic premise and then applies it in some illegal backwards or opposite fashion. There was no conditional logic premise here, so it can't be this flaw. Conversationally, there's no "condition that by itself guarantees the occurrence of a certain phenomenon", so we can bail from this answer at that point.

  5. Wrong Flaw7% picked this

    bases a broad claim about the behavior of people in general on a comparison between two groups of people that together include only

    This describes the famous Sampling flaw, in which an author extrapolates from a sample that is too small to be trustworthy, unrepresentative, self-selecting or biased in some way. This conclusion is a broad claim about the behavior of people in general. Is the evidence a comparison between two groups that together include only a small proportion of people? Nope, the evidence is based on comparing literally everyone. Since the correlation deals with binary groups (people who own VCRs / people who don't own VCRs), every person in existence is covered in that comparison. You either own one or don't.

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