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Five years ago, during the first North American outbreak of

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Five years ago, during the first North American outbreak of [#permalink] New post 07 Jun 2009, 06:09
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A
B
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D
E

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Five years ago, during the first North American outbreak of the cattle disease CXC, the death rate from the disease was 5 percent of all reported cases, whereas today the corresponding figure is over 18 percent. It is clear, therefore, that during these past 5 years, CXC has increased in virulence.
Which one of the following, if true, most substantially weakens the argument?

(A) Many recent cattle deaths that have actually been caused by CXC have been mistakenly attributed to another disease that mimics the symptoms of CXC.
(B) During the first North American outbreak of the disease, many of the deaths reported to have been caused by CXC were actually due to other causes.
(C) An inoculation program against CXC was recently begun after controlled studies snowed inoculation to be 70 percent effective in preventing serious cases of the illness. (D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.
(E) Cattle that have contracted and survived CXC rarely contract the disease a second time.
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Re: North American outbreak [#permalink] New post 07 Jun 2009, 06:14
Is it D?

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(3:30)
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Re: North American outbreak [#permalink] New post 07 Jun 2009, 07:20
sudeep wrote:
Is it D?

---
(3:30)



I got D as well.

Let me give you an example to make this problem clearer. Suppose that out of 100 persons reported to be sick, only 10% of them actually died. Now, we have report saying that 20% of the people have now died because of the disease. Well, 20% can also be reached if the total number of people who got sick actually reduced to 50. So suppose that we still have the same number of people who died, which is 10.....10/50 is 20%. So just because the percent has increased doesn't necessarily mean that the actual number of those who died has increased. The total number of people who were reported as sick could have reduced, making the overal percentage bigger.
Re: North American outbreak   [#permalink] 07 Jun 2009, 07:20
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