by ohthatpatrick Mon Jul 27, 2015 6:32 pm
"I'm a bit confused. I still feel that E is a stronger explanation because Tiya provides new information, that the defects will be revealed a few years later, to undermine the conclusion that there are no defects. "
You're using stronger than appropriate language by saying "will be" revealed.
Tiya says "at least one manufacturing defect in an automobile was not apparent for the first few years".
That's WAY different from "Starlight automobiles WILL have defects in a few years".
Of course that's the POSSIBILITY that Tiya is suggesting, but it's just a possibility, not a definite.
You correctly said that Tiya is merely UNDERMINING Sam's conclusion, not REFUTING it.
(E) says that Tiya is REFUTING the conclusion. (C) says that Tia is UNDERMINING the argument.
You're using an everyday definition of "implies" to mean "hints at, suggests, indirectly gives us that impression".
Look up "imply" in a dictionary and you'll see the secondary meaning that LSAT, and other legal writers, use.
To "imply" is essentially to guarantee. An "implication" is a logical consequence of something.
A implies B = A --> B
A proves B
A guarantees B
A requires B
etc.
In terms of how Tiya's response undermines Sam's support....
Sam is trying to prove that Starlights don't have manufacturing defects.
What is Sam's support?
There's a survey that suggests that Starlight owners have not experienced a manufacturing defect in the first year of owning their new Starlight.
Okay, are you convinced? If you haven't experienced a defect in the first year of owning a new car, are you convinced that the car does NOT have any manufacturing defects?
Nope, because as Tiya reminds us, manufacturing defects don't necessarily appear during the first year.
Sam's support requires an assumption that the 1st year is all we need to worry about when it comes to manufacturing defects.
(C) shows us that this assumption is wrong, so now Sam's support seems inadequate to justify his conclusion.
I think you're hearing (C) too narrowly as "Tiya went against Sam's premise", but you wanna hear it more as "Tiya showed why Sam's evidence isn't good enough".
== other answers ===
(A) Tiya is not arguing that Sam is correct. If anything, Tiya is suggesting that Sam is wrong.
(B) Tiya isn’t attacking the truth of Sam’s survey. She is implicitly accepting the survey is true, but suggesting that the survey is an incomplete part of the picture, since the survey only deals with the first year of owning a Starlight.
(D) “presupposes the truth of the conclusion” = Circular argument = “the conclusion is a restatement of the premise”. If Sam’s argument were circular, it would sound like “Starlight cars are free from manufacturing defects. After all, Starlight cars are defect-free.”
Nothing in Tiya’s sentence sounds like she’s accusing Sam of saying anything like this.