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A certain laboratory is studying the incidence of fatal

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A certain laboratory is studying the incidence of fatal [#permalink]

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21 Jul 2008, 01:09
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A certain laboratory is studying the incidence of fatal liver damage in rats.-Sixty-five percent of all rats whose environments exposed them to low levels of the toxin sulfur dioxide died of liver disorder. Ninety percent of all rats who died of liver disorder, however, were not exposed to any environmental toxins.

Which of the following would provide a feasible explanation for the statistics above?

A Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive.
B There is only one cause of fatal liver disease in rats.
C Environmental toxins are not particularly dangerous to the livers of rats.
D Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide.
E Most rats will not suffer from exposure to low levels of sulfur dioxide.
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21 Jul 2008, 01:44
x97agarwal wrote:
A certain laboratory is studying the incidence of fatal liver damage in rats.-Sixty-five percent of all rats whose environments exposed them to low levels of the toxin sulfur dioxide died of liver disorder. Ninety percent of all rats who died of liver disorder, however, were not exposed to any environmental toxins.

Which of the following would provide a feasible explanation for the statistics above?

A Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive.
B There is only one cause of fatal liver disease in rats.
C Environmental toxins are not particularly dangerous to the livers of rats.
D Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide.
E Most rats will not suffer from exposure to low levels of sulfur dioxide.

a) because both environmental and nonenvironmental causes cause liver disease
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21 Jul 2008, 01:51
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I think its D.
Assuming 100 rats were in the study and 90 rats died due to liver damage.
90% of those died were not exposed to environmental toxins-> 81
Which means that 9 might have died due to toxins. If 13 were exposed to toxins,
65% of those exposed to toxins died-> ~9

This should give a feasible solution to the problem. ie, "Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide"

"Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive" also is very compelling, howeve, I will go with D.
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21 Jul 2008, 02:08
Ans should be D
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21 Jul 2008, 02:12
using the same logic i.e. 100 rats etc etc

vote for D
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21 Jul 2008, 10:27
Between A and D.

I choose D based on the same logic given above.
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21 Jul 2008, 10:32
leonidas wrote:
I think its D.
Assuming 100 rats were in the study and 90 rats died due to liver damage.
90% of those died were not exposed to environmental toxins-> 81
Which means that 9 might have died due to toxins. If 13 were exposed to toxins,
65% of those exposed to toxins died-> ~9

This should give a feasible solution to the problem. ie, "Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide"

"Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive" also is very compelling, howeve, I will go with D.

OA D. Good explanation. Kudos for you.
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Re: A certain laboratory is studying the incidence of fatal [#permalink]

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10 Oct 2013, 21:14
Its a straight D. The thing with percentage questions is that if u pay close attention to the statistics, you can come up with an answer without reading the answer choices.
Re: A certain laboratory is studying the incidence of fatal   [#permalink] 10 Oct 2013, 21:14
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