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#4 - In an experiment testing whether hyperactivity is due

kcho10
LSAT Leader
 
Posts: 69
Joined: Mon Nov 02, 2015 7:10 pm
Points: 50

Hi,

I'm not sure why E doesn't weaken the argument. I can see why D weakens more than E, but the LSAC explanation makes it seem like it doesn't weak then argument at all. E says that the test was performed only on adults. Doesn't that suggest that it's an unrepresentative sample? The conclusion doesn't confine the scope of the argument to adults only.

Thank you in advance
Jennifer Janowsky
PowerScore Staff
PowerScore Staff
 
Posts: 91
Joined: Sun Aug 20, 2017 11:58 pm
Points: 91

Hi! Great question. Answer choice (E) points out that only adults were considered, which is an interesting point as it calls into question the research group. However, the fact that the result was found in adults alone doesn't immediately hurt the conclusion that "diminished activity is one cause of hyperactivity." Alternately, choice (D) much more directly harms that conclusion--it presents an alternate cause, their medication, for their decreased brain activity.

So, as you said, answer choice (E) does seem to indirectly weaken the conclusion, whereas (D) does so much more directly and to a greater degree.

I hope that is helpful!