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Blood banks

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by freakomalay » Mon May 25, 2009 12:29 am
Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. Therefore, about 10 percent of actual donors will still supply NANB-contaminated blood.

19. The argument above depends on which of the following assumptions?
(A) Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.
(B) Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.
(C) The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.
(D) The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.
(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.
AIMing 700+ ..............
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by scoobydooby » Mon May 25, 2009 2:23 am
would go for C

A. infections other than NAND hepatitis is out of scope

B. whether donors develop the disease is out of scope

C. by POE.

D. incidence of hepatitis is out of scope. the stimulus talks about carriers of the hepatitis virus

E. frequency of donating blood is out of scope.
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by rahulg83 » Mon May 25, 2009 7:10 am
I second C
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by Musicolo » Mon May 25, 2009 7:21 am
either C or E, but I would go for E.
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by 2010gmat » Mon May 25, 2009 10:53 am
IMO A

wat if NANB affected donors also have other infections?? they will be screened ...
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by tdadic84 » Mon May 25, 2009 10:59 am
2010gmat...other infections are out of scope...
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by axat » Mon May 25, 2009 11:15 am
I will go with B.
Because they do not develop the disease, the testing will not identify them as carriers of the virus. This is what is implied.

What's the OA?

A- outta scope. Who cares about other diseases!
C- assuming this is a bit of a stretch.
D- outta scope
E- the frequency won't affect the percentage.
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by vinaynp » Mon May 25, 2009 2:18 pm
The OA is [spoiler] A) [/spoiler] and I agree with 2010gmat.

We can infer that 15% of the donors carry NANB hepatitis.
5% of the donors carrying NANB hepatitis will be screened by the tests.

Hence, 10% of the donor carrying NANB hepatitis will not be screened. For this to be true, these 10% of the donors should not be screened by any other tests.

Hence, A) is correct.
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by james33 » Sun May 15, 2016 7:46 pm
I think E is the right answer here
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