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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] New post 16 Jan 2006, 15:18
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A
B
C
D
E

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100% (01:02) correct 0% (00:00) wrong based on 1 sessions
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 chose C, but the correct answer aparently is A. I am not sure why...

Thanks!
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 19 Dec 2011, 09:42
I don't understand the question intend.. :|
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 20 Dec 2011, 04:28
chitownguy 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 chose C, but the correct answer aparently is A. I am not sure why...

Thanks!


Choice A states that the test machine use only for checking NANB hepatitis, not other disease. If this test machine use for other disease, then the figure will be wrong.
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 20 Dec 2011, 23:28
I go with option D
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 21 Dec 2011, 01:03
-- new screening will catch 5 % of all perspective donors
-- but still miss 2/3 of the contaminated donors

-- so, 10 % of dinners will donate contaminated blood


A) Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.
the only one that survives.
(B) Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.
-- out of scope
(C) The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.
-- we know that 5% of total prospective donors = 2/3 of the contaminated population
no relation other than this, wrong
(D) The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.
-- out of scope.
(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.
-- cannot be said.
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 21 Dec 2011, 03:26
I will go with A, because the % increases as there are no proper tests for other disesses..........But initially i too got this question wrong...but later seeing the OA thought this might be the explanation.............

Hope this is correct
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 21 Dec 2011, 20:30
IMO A
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Re: Blood banks will shortly start to screen all donors for NANB [#permalink] New post 26 Dec 2011, 08:16
A using POE
as all other fails to point out why still NANB downers will pass the screening
Re: Blood banks will shortly start to screen all donors for NANB   [#permalink] 26 Dec 2011, 08:16
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Blood banks will shortly start to screen all donors for NANB

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