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chemiacal comp

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chemiacal comp [#permalink] New post 23 Jan 2008, 21:12
A chemical comp claims that, since only one of 520 rats that were given high doses of a new artificial sweetner developed cancer while all the others remained healthy, the sweetner is not carcinogenic for human beings and ought to be approved for consumption for human consumption.

Which of the following, if true, most strongly supports the chemical company's claim?

(A)Chemicals that are carcinogenic for rats are uaually also carcinogenic for other animals, such as guinea pigs, used in experiments.
(B)The spontaneous incidence of cancer in this particular strain of rat is approx one in 540.
(C)Tests conducted on a certain strain of mouse show that, of 500 mice given a dose of sweetner similar to that of rats, 53 developed cancer.
(D)Certan chemicals that are carcinogenic for human beings have been shown not to be carcinogenic for rats.
(E)The average lifespan of the strain of rat used in the experiment when the rats wrer 13 months old.
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Re: chemiacal comp [#permalink] New post 23 Jan 2008, 21:41
B supports the claim.

"B"
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Re: chemiacal comp [#permalink] New post 23 Jan 2008, 21:45
LM wrote:
B supports the claim.

"B"


i think its A. . .
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Re: chemiacal comp [#permalink] New post 23 Jan 2008, 23:28
(A)Chemicals that are carcinogenic for rats are usually also carcinogenic for other animals, such as guinea pigs, used in experiments. [We need to check against humans - Irrelevant]
(B)The spontaneous incidence of cancer in this particular strain of rat is approx one in 540.[This choice weakens the conclusion]
(C)Tests conducted on a certain strain of mouse show that, of 500 mice given a dose of sweetener similar to that of rats, 53 developed cancer.[Mice is not mentioned in the argument – Eliminate it]
(D)Certain chemicals that are carcinogenic for human beings have been shown not to be carcinogenic for rats.[Hold it]
(E)The average lifespan of the strain of rat used in the experiment when the rats were 13 months old.[Irrelevant]

Answer: D
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Re: chemiacal comp [#permalink] New post 23 Jan 2008, 23:58
Updating to B from A as B seems to be making more sense now...
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Last edited by suntaurian on 25 Jan 2008, 00:40, edited 1 time in total.
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Re: chemiacal comp [#permalink] New post 24 Jan 2008, 02:42
Conclusion here is that the sweetner will not cause cancer in humans since only 1/520 rats got cancer in a trial on 520 rats. The questions asks what will support this.

blog wrote:
A chemical comp claims that, since only one of 520 rats that were given high doses of a new artificial sweetner developed cancer while all the others remained healthy, the sweetner is not carcinogenic for human beings and ought to be approved for consumption for human consumption.

Which of the following, if true, most strongly supports the chemical company's claim?

(A)Chemicals that are carcinogenic for rats are uaually also carcinogenic for other animals, such as guinea pigs, used in experiments. irrelevant
(B)The spontaneous incidence of cancer in this particular strain of rat is approx one in 540. lets see, so without any sweetner, a normal rat has 1/540 chance of getting cancer. So it can be assumed that the 1 rat that did get cancer in the trial did not get it because of sweetner, since 1/520 is approx. the normal rate anyways. So this proves that the sweetner is A-OK for humans
(C)Tests conducted on a certain strain of mouse show that, of 500 mice given a dose of sweetner similar to that of rats, 53 developed cancer. weakens the conclusion, in some ways. so we can eliminate
(D)Certan chemicals that are carcinogenic for human beings have been shown not to be carcinogenic for rats. weakens the conclusion. So this is eliminated since we are asked for something that strongly supports the conclusion.
(E)The average lifespan of the strain of rat used in the experiment when the rats wrer 13 months old. strain of rats? i think its a typo here.
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Re: chemiacal comp [#permalink] New post 24 Jan 2008, 04:35
Expert's post
B

A chemical comp claims that, since only one of 520 rats that were given high doses of a new artificial sweetner developed cancer while all the others remained healthy, the sweetner is not carcinogenic for human beings and ought to be approved for consumption for human consumption.

Which of the following, if true, most strongly supports the chemical company's claim?

the first assumption: one of 520 is not carcinogenic.
the second assumption: not carcinogenic for rats means not carcinogenic for human.


(A)Chemicals that are carcinogenic for rats are usually also carcinogenic for other animals, such as guinea pigs, used in experiments.
irrelevant.Two flaws: "animals" instead of "human", "carcinogenic" instead of "not carcinogenic".

(B)The spontaneous incidence of cancer in this particular strain of rat is approx one in 540.
it is the first assumption.

(C)Tests conducted on a certain strain of mouse show that, of 500 mice given a dose of sweetner similar to that of rats, 53 developed cancer.
irrelevant. Is 53 of 500 normal?

(D)Certan chemicals that are carcinogenic for human beings have been shown not to be carcinogenic for rats.
weaken

(E)The average lifespan of the strain of rat used in the experiment when the rats wrer 13 months old.
irrelevant.
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Re: chemiacal comp [#permalink] New post 24 Jan 2008, 05:48
so many answers whats the right one?
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Re: chemiacal comp [#permalink] New post 24 Jan 2008, 23:49
I think it is A because pharmaceutical companies perform drug tests on guinea pig to ensure that it is successful before using the drugs on humans.
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Re: chemiacal comp [#permalink] New post 04 Feb 2008, 20:07
I go for B.
OA pls?
Re: chemiacal comp   [#permalink] 04 Feb 2008, 20:07
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