Lack of support v. false conclusion

(LSvFC)

Stimuli that reason from premises saying "X has not been proven" to a conclusion saying "X must be false."

Avg. 0.25 per section
13%
13%
41%
28%
5%

Avg. difficulty: 3.0

Key tactics

  • Here's an example of a flawed argument of this type:
  • Gladis thinks the website we are on right now is called 7sage.com. She claims to know this because she cast her soul into the astral plane and communed with a goatman on Ganymede, who told her this website is called 7sage.com. Obviously Gladis is a crazy person, so this website must not be 7sage.com
  • Just because the evidence offered FOR a claim does not hold up, that absence or weakness of evidence does NOT count as evidence AGAINST the claim.

Answer choice tips

  • Example answer choices that point to this flaw:
  • rejects the possibility that what has not been proven is nevertheless true.
  • infers that there is no extraterrestrial intelligence in neighboring star systems from the lack of proof that there is.
  • reasons that since Smith never disproved the claim that he threatened Lopez, he did in fact threaten her.

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