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Expert witness: Ten times, and in controlled circumstances,

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Director
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Expert witness: Ten times, and in controlled circumstances, [#permalink] New post 15 Sep 2005, 18:03
00:00
A
B
C
D
E

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Expert witness: Ten times, and in controlled circumstances, a single drop of the defendant's blood was allowed to fall onto the fabric. And in all ten cases, the stained area was much less than the expected 9.5 cm2. In fact, the stained area was always between 4.5 and 4.8 cm2. I conclude that a single drop of the defendant's blood stains much less than 9.5 cm2 of the fabric.

Which one of the following, if true, most undermines the value of the evidence for the expert witness's conclusion?

A) If similiar results had been found after 100 test drops of the defendant's blood, the evidence would be even stronger.
B) Expert witness have sometimes been known to fudge their data to accord with the prosecution's case.
C) In an eleventh test drop of the defendant's blood, the area stained was also less than 9.5 cm2 - this time staining 9.3 cm2.
D) Another person's blood was substituted, and in otherwide indentical circumstances, stained between 9.8 and 10.6 cms2 of the fabric.
E) Not all expert witnesses are the authorities in their fields that they claim to be.
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 [#permalink] New post 15 Sep 2005, 18:18
C is my choice. Shows the variability in the results.
A only corroborates.
B not relevant
D no comparison between another person's blood and the defendants.
E not relevant
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 [#permalink] New post 15 Sep 2005, 19:19
Good explanation, anandsebastin.
I agree, (C)
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 [#permalink] New post 16 Sep 2005, 08:00
Yeah, I got down to A and C on this one and took C. A doesn't hurt the argument as much as C does. C shows that the stain isn't substantially less than 9.5 and draws the expert's results into question.
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 [#permalink] New post 16 Sep 2005, 20:10
This is a clear C!
The word to look out for is Much less than!
C proves that wrong!
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 [#permalink] New post 17 Sep 2005, 01:13
Between B and C, I wud choose B.
I dont think B, here, is irrelavant. Assume B to be true and say, if this witness aslo falls in that category, then the entire logic can be outrightly discarded.

OA/OE Plz.
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 [#permalink] New post 19 Sep 2005, 09:05
IMO its a clear C. Shows variability.

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 [#permalink] New post 19 Sep 2005, 13:45
Clearly C[/b]
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 [#permalink] New post 19 Sep 2005, 15:23
Agree with (C). Result of 11th drop clears opposes the conclusion.
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 [#permalink] New post 20 Sep 2005, 16:20
pretty straight forward...C.
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 [#permalink] New post 23 Sep 2005, 14:58
Clear C.
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 [#permalink] New post 30 Sep 2005, 14:05
OA please.
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Re: [#permalink] New post 27 Dec 2013, 13:30
nakib77 wrote:
OA please.
OA is C.
First things first. Any option with some in weakener question is considered a bad choice. By this, E and B becomes bad choices for weaken question. If you are surprised with E being qualified for Some, please note that "Not All" means not 100% and I have made a little adjustment while comparing "Not All" to "Some". Since, both "Not All" and "Some" can refer to a sample size of as less as 1% of sample, weakening options with these qualifiers are considered weak weakeners and are mostly distractions in weaken questions.
"Not All" covers 0% to 99% sample
"Some" covers 1% to 100% of sample

A is a strengthener as it supports the case in the event of further investigation. D is irrelevant leaving C as winner.
What we have to understand is that
1) if 11th drop came increasingly near to 9.3 cm2, then 12th may become 9.8cm2 and thus destroy conclusion.
2) Conclusion says MUCH LESS. This is not the case with 9.3cm2

Some related good explanations are also at this link: http://www.manhattanlsat.com/forums/q17 ... t4840.html
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Re:   [#permalink] 27 Dec 2013, 13:30
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