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lichenrachel
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Post subject: Pt6 S3 Q17 Samples from the floors of a rock shelter in Penn  Posted: Fri Sep 10, 2010 7:54 am |
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Let's see if I understand answer A's argument correctly: Since there is no likely mechanism of contamination that permits contaminating only the deeper samples, if the samples are contaminated at all, they would all be contaminated by "old carbon", and the uppermost sample should be dated "later than present", hence not possible.
Am I right?
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bbirdwell
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Post subject: Re: Pt6 S3 Q17 Samples from the floors of a rock shelter in Penn Posted: Sat Sep 11, 2010 5:00 pm |
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Sounds pretty good to me. Essentially, all the samples would've been contaminated and thus be equally "old," or have conflicting dates. You got it...
_________________ Every once in awhile I host a free online workshop/question&answer session. called Zen and the Art of LSAT You can check out a few recordings from past sessions here: http://www.manhattanlsat.com/zen-and-the-art.cfm
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geverett
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Post subject: Re: Q17 - Samples from the floors of a rock shelter in Penn Posted: Tue Aug 30, 2011 8:21 pm |
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This is somewhat odd Brian. I was stuck between A and D and chose A, because D would seem to refute the correlation of samples getting older the deeper they went. It would represent an inverse correlation as opposed to the direct correlation (the deeper the sample the older it is) cited in the stimulus. However, A seems kind of weak as well because while the critics attack the deeper samples date they don't say anything about the more recent sample. Yet A seems to assume that they agree with the dates assigned to the more recent samples. Thoughts?
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bbirdwell
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Post subject: Re: Q17 - Samples from the floors of a rock shelter in Penn Posted: Thu Sep 01, 2011 11:35 am |
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The skeptics claim that contamination made the samples appear too old.
(A) says "If that happened, then ALL the samples would have been affected, and therefore appeared toooooooo old." And we know this didn't happen, because there was a steady progression from the present backwards.
In other words, (A) says there's no way to have one really old, contaminated sample without screwing up all the others. And, based on the premises, we know that the others were not screwed up. See what I mean?
It's got to be our answer.
(D) You're correct. (D) points out that there was a bunk re-test. Careful about your task here. This choice SUPPORTS the skeptics! We want to refute them!
_________________ Every once in awhile I host a free online workshop/question&answer session. called Zen and the Art of LSAT You can check out a few recordings from past sessions here: http://www.manhattanlsat.com/zen-and-the-art.cfm
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geverett
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Post subject: Re: Q17 - Samples from the floors of a rock shelter in Penn Posted: Sun Sep 04, 2011 12:56 am |
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A ha! It just clicked. The samples date from the present to the oldest sample underground. If A were the case then the samples on the top dated to the present would then be dated older than the present which is impossible. Very good.
Not sure how answer choice D supports the skeptics though. It basically says that the samples were assigned the same or later date as the located above them which as I mentioned represents an inverse correlation of sorts.
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