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# blood

Author Message
VP
Joined: 09 Jul 2007
Posts: 1102
Location: London
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05 Sep 2007, 19:18
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.
If you have any questions
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Director
Joined: 08 Jun 2007
Posts: 578
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05 Sep 2007, 19:28
Brutal...not sure but betting on D
Manager
Joined: 20 Jun 2005
Posts: 145
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Kudos [?]: 134 [0], given: 0

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05 Sep 2007, 19:48
Ravshonbek 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.
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.

straight C by POE.

others are irrelevant.
Manager
Joined: 07 Mar 2007
Posts: 199
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05 Sep 2007, 20:30
This is a good tough CR. In fact, i JUST came across it in CR1000 right before I saw this post. Since, i know the answer already I'm not going to take a crack at it. However, I could use some an explanation for the correct answer. I got this one wrong
Director
Joined: 09 Aug 2006
Posts: 757
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06 Sep 2007, 01:13
Ravshonbek 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.
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.

Surely couldn't take a crack at it within 2 mins. I'll go with E.
C is true but I don't think it's essential for the argument to stand.
D seems to be opposing the argument according to me.
Manager
Joined: 09 Jul 2007
Posts: 178
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06 Sep 2007, 02:19
i'm also for E

C is irrelevant and D is out of scope
Manager
Joined: 20 Jun 2007
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06 Sep 2007, 06:16
By POE, A. All other options are irrelevant.

A opens up the possibility that some of the remaining 10% of infected blood donors will be screened out by another process, so the real figure will be less than 10%.
VP
Joined: 10 Jun 2007
Posts: 1443
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06 Sep 2007, 06:49
Ravshonbek 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.
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.

Tough...
I got E by POE.
Re: blood   [#permalink] 06 Sep 2007, 06:49
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