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

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22 Dec 2007, 10:44
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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.

I felt this was also a mean question. i need someone to explain this as well.
thanks
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22 Dec 2007, 11:34
My take is A.

Lets say assumption in A is wrong. This means donors carrying NANB, in large percentages, also carry other infections for which reliable screening tests are performed. Out of the escaped (10%) of NANB carriers, a good percentage will be filtered out for other infections and the number of donors supplying NANB infected blood will be substantially less than 10%.
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Re: CR: tough one [#permalink]

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22 Dec 2007, 16:58
tarek99 wrote:
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.

I felt this was also a mean question. i need someone to explain this as well.
thanks

A. if this is true, then the argument is weakened.
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23 Dec 2007, 06:54
OA is A
23 Dec 2007, 06:54
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Blood banks will shortly start to screen all donors for NANB

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