Blood banks will shortly start to screen all donors for NANB : GMAT Critical Reasoning (CR)
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# Blood banks will shortly start to screen all donors for NANB

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Director
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Blood banks will shortly start to screen all donors for NANB [#permalink]

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19 Nov 2005, 09:07
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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.
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.
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19 Nov 2005, 23:09

(E) The donors who will still supply NANB-contaminated blood will NOT donate blood at the average frequency for all donors

This will affect the conclusion that "about 10 percent of actual donors will still supply NANB-contaminated blood".

Director
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19 Nov 2005, 23:41
I vote for 'A'.
What is the OA?
Manager
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20 Nov 2005, 08:21
One more A.

Negate A: If donors carrying NANB hepatitis, in a large percentage of cases, carried other infections for which reliable screening tests are routinely performed, such donors will be eliminated from donating blood.

The conclusion then would be weakened.

E is close, however, A is the OA (source: OG11)
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20 Nov 2005, 08:28
yup got A as well.
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hey ya......

20 Nov 2005, 08:28
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