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Questions 1-2 are based on the following. Blood banks will

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Questions 1-2 are based on the following. Blood banks will [#permalink]

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New post 28 Jun 2009, 23:12
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Questions 1-2 are based on the following.
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.
1. 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.

2. Which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?
(A) The incidence of new cases of NANB hepatitis is likely to go up by 10 percent.
(B) Donations made by patients specifically for their own use are likely to become less frequent.
(C) The demand for blood from blood banks is likely to fluctuate more strongly.
(D) The blood supplies available from blood banks are likely to go down.
(E) The number of prospective first-time donors is likely to go up by 5 percent.

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Re: Blood Bank [#permalink]

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New post 28 Jun 2009, 23:36
For first one: I am confused with D & E. 10% of actual donors & 2/3 of NANB : there is a difference in actual vs NANB infected cases.

For second one:

It can be "D"

Kindly confirm my thinking!! :)
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Re: Blood Bank [#permalink]

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New post 28 Jun 2009, 23:48
ankur55 wrote:
Questions 1-2 are based on the following.
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.
1. 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.


Using the negation test, I find (A) to be the best answer. If a large percentage of carriers can be detected because they carry other infections, then the actual number of carriers who end up donating will be reduced; they will be filtered out by other tests.

Quote:
2. Which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?
(A) The incidence of new cases of NANB hepatitis is likely to go up by 10 percent.
(B) Donations made by patients specifically for their own use are likely to become less frequent.
(C) The demand for blood from blood banks is likely to fluctuate more strongly.
(D) The blood supplies available from blood banks are likely to go down.
(E) The number of prospective first-time donors is likely to go up by 5 percent.


The safest answer here would be (D). We know the new test will disqualify a percentage of potential donors that is greater than 0 & less than 5. So, all else being equal, we can expect the available blood supplies to decrease, since less people are able to donate.

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Re: Blood Bank [#permalink]

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New post 29 Jun 2009, 01:32
Yes indeed OA is A and D
Thanks, understood the explanation.

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Re: Blood Bank [#permalink]

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New post 30 Jun 2009, 00:14
Nice tough question..
A and D should be the answers..

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Re: Blood Bank [#permalink]

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New post 24 Jul 2009, 03:27
GMATaddict wrote:
ankur55 wrote:
Questions 1-2 are based on the following.
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.
1. 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.


Using the negation test, I find (A) to be the best answer. If a large percentage of carriers can be detected because they carry other infections, then the actual number of carriers who end up donating will be reduced; they will be filtered out by other tests.

Quote:
2. Which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?
(A) The incidence of new cases of NANB hepatitis is likely to go up by 10 percent.
(B) Donations made by patients specifically for their own use are likely to become less frequent.
(C) The demand for blood from blood banks is likely to fluctuate more strongly.
(D) The blood supplies available from blood banks are likely to go down.
(E) The number of prospective first-time donors is likely to go up by 5 percent.


The safest answer here would be (D). We know the new test will disqualify a percentage of potential donors that is greater than 0 & less than 5. So, all else being equal, we can expect the available blood supplies to decrease, since less people are able to donate.


for 1st question why cant the ans be E.If you apply the negation test to E,then it would be that the donors are not donating blood at the aveg frequency as other donors,then also their number would decrease.

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Re: Blood Bank [#permalink]

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New post 24 Jul 2009, 03:48
Good question..
A and D for me too..
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Re: Blood Bank [#permalink]

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New post 24 Jul 2009, 17:49
shrutisingh wrote:
GMATaddict wrote:
ankur55 wrote:
Questions 1-2 are based on the following.
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.
1. 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.


Using the negation test, I find (A) to be the best answer. If a large percentage of carriers can be detected because they carry other infections, then the actual number of carriers who end up donating will be reduced; they will be filtered out by other tests.

Quote:
2. Which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?
(A) The incidence of new cases of NANB hepatitis is likely to go up by 10 percent.
(B) Donations made by patients specifically for their own use are likely to become less frequent.
(C) The demand for blood from blood banks is likely to fluctuate more strongly.
(D) The blood supplies available from blood banks are likely to go down.
(E) The number of prospective first-time donors is likely to go up by 5 percent.


The safest answer here would be (D). We know the new test will disqualify a percentage of potential donors that is greater than 0 & less than 5. So, all else being equal, we can expect the available blood supplies to decrease, since less people are able to donate.


for 1st question why cant the ans be E.If you apply the negation test to E,then it would be that the donors are not donating blood at the aveg frequency as other donors,then also their number would decrease.


to my understanding, E can't be the answer because the article talked about each donor, so for example. a donor that donates multiple times a year is the same as a donor that donate one time a year...so the frequency is not discussed in this passage?

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Re: Blood Bank [#permalink]

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New post 31 Jul 2009, 14:31
A and D make most sense to me

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Re: Blood Bank [#permalink]

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New post 01 Aug 2009, 16:35
a and d for me too

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Re: Blood Bank [#permalink]

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New post 02 Aug 2009, 09:40
I had thought for E & D. but now i get why its has to be A for first question
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Re: Questions 1-2 are based on the following. Blood banks will [#permalink]

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New post 26 Aug 2014, 19:56
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

this passage is about attributes of blood donated by donors and conclusion drawn from it.
Con: Roughly, 10% of donors will supply nanb 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.

Indeed it is correct: Yes, at the time of taking blood, if hospitals conduct routine tests for other diseases, then they will be rejected by other means . Thus arugment breaks.

(B) Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.
We are talking about contaminiation of blood because of hepatitis blood donors. Impact on the donors itselt is out of scope.
(C) The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.
I am not getting into stastics. Out of scope. It doesn't matter if 1000 people donate and i estimate at 10%. Concern is 10% of donors supply contaminated blood.
(D) The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.
We are not comparing.
(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors

Here we are comparing the frequency of blood donation . Each specific time is considered a donor. Out of scope.

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Re: Questions 1-2 are based on the following. Blood banks will [#permalink]

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Re: Questions 1-2 are based on the following. Blood banks will [#permalink]

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New post 06 Sep 2017, 01:46
For first question the answer is A
B,C and D are irrelevant .
E is actually a strengthener .
For second question the answer is D
Still I am not sure about the answer to the second question .
I arrived at the answer to second question by POE.
Can anyone explain the reasoning behind choosing D for second question.

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Re: Questions 1-2 are based on the following. Blood banks will   [#permalink] 06 Sep 2017, 01:46
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