Q6 - The only vehicles that have high resale values

[ohthatpatrick]

Question Type:
Match the Flaw

Stimulus Breakdown:
Conclusion: Any well-maintained vehicle has high resale.
Evidence: The only vehicles with high resale are those that are well maintained.

Answer Anticipation:
Match the Flaw usually pulls from the 10 Famous Flaws (in particular, Nec vs. Suff, Correlation vs. Causality, Unproven vs. Untrue, Part vs. Whole, and Sampling)

Since we see conditional logic triggers, "the only" and "any", we can be reasonably confident going in that this will be a conditional logic flaw (aka. "Nec vs. Suff).

Indeed, it is!
The premise is that "If you have high resale, then well maintained".
The conclusion is "If you are well maintained, then you have high resale".

ANY = left side idea
THE ONLY = left side idea
(ONLY and ONLY IF = right side ideas)

Correct Answer:
D

Answer Choice Analysis:
(A) EVID: "If in the garden, hasn't been pruned". CONC "If in the garden, doesn't need pruning". Not a conditional logic reversal.

(B) EVID: "if best mediator, then longest track record" CONC "If the worst mediator, then the shortest track record". Almost. It's like an illegal negation, but these aren't actually conditional ideas. It's a slightly different flaw to say "because the #1 A's are also the #1 B's, we can conclude that the last place A's are also the last place B's."

(C) We can tell this conclusion isn't a reversal of the evidence, because the concept "most important factor" only appears in the conclusion

(D) YES, here's our reversal! EVID: "If a city dweller, prefer waterfall to traffic jam" CONC: "If prefer waterfall to traffic jam, then city dweller".

(E) The evidence is not a conditional, it's a "the more X, the more Y" type correlation. So there's no way for the conclusion to be a reversed conditional.

Takeaway/Pattern: We're looking for an illegal reversal, so we want to first sign off on the idea that the evidence was of the form "if X, then Y". If it isn't, we can eliminate and stop reading. If it is, then we can check whether the conclusion says "if Y, then X".

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