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Blood banks will shortly start to screen all donors for NANB

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SVP
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Blood banks will shortly start to screen all donors for NANB [#permalink] New post 01 Nov 2005, 03:42
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A
B
C
D
E

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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
19. 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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 [#permalink] New post 02 Nov 2005, 08:47
Tough call between A and E.

A - Correct - This is an assumption.
B - Incorrect - develop the disease themselves
C - Incorrect - Argument is not under/over estimating
D - Incorrect - We are not talking of the incidence of the incidence of NANB hepatitis
E - Incorrect - If the frequency changes the percentages would be maintained as per the argument.

What is the OA/OE?
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 [#permalink] New post 02 Nov 2005, 10:16
A.

If people carrying hep N are infected with something else then they will be disqualified if that infection gets detected.
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 [#permalink] New post 07 Nov 2005, 06:39
OA is A.
good job.
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  [#permalink] 07 Nov 2005, 06:39
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Blood banks will shortly start to screen all donors for NANB

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