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# At the Centers for Disease Control and Prevention, epidemiologists

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Manager
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
At the Centers for Disease Control and Prevention, epidemiologists  [#permalink]

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01 Oct 2017, 13:36
3
00:00

Difficulty:

55% (hard)

Question Stats:

64% (01:34) correct 36% (01:44) wrong based on 138 sessions

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At the Centers for Disease Control and Prevention, epidemiologists recently proved that sandwiches, even if left in refrigerators, can become infested with viruses that cause illness. They found that infestation usually occurs after sandwiches have been left for seven weeks. For that reason, people should discard leftover sandwiches at least once every seven weeks.

Which of the following, if true, would most weaken the conclusion provided?

a) The epidemiologists could not understand why infestation happened only after sandwiches were left for seven weeks, and not before.
b) The epidemiologists did not research possible infestation of sandwiches by bacteria, bugs, and other pathogenic organisms.
c) The epidemiologists found that, among people who ate sandwiches infested with viruses, the infection rate was no higher than among people who did not eat infested sandwiches.
d) The epidemiologists discovered that eaters who irradiated their sandwiches in a microwave thoroughly and sterilized the eating area were as likely to have infested sandwiches as were people who only dusted off their sandwiches.
e) The epidemiologists discovered that, for sandwiches left in the refrigerator for nine weeks, being left for longer durations did not correlate with a higher number of viruses being present.

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Re: At the Centers for Disease Control and Prevention, epidemiologists  [#permalink]

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01 Oct 2017, 23:29
Imo C. It's the time when infestation begins that should matter than whether the infestation progresses.
What is the OA?

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Re: At the Centers for Disease Control and Prevention, epidemiologists  [#permalink]

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02 Oct 2017, 03:28
bkpolymers1617 wrote:
At the Centers for Disease Control and Prevention, epidemiologists recently proved that sandwiches, even if left in refrigerators, can become infested with viruses that cause illness. They found that infestation usually occurs after sandwiches have been left for seven weeks. For that reason, people should discard leftover sandwiches at least once every seven weeks.

Which of the following, if true, would most weaken the conclusion provided?

a) The epidemiologists could not understand why infestation happened only after sandwiches were left for seven weeks, and not before.
b) The epidemiologists did not research possible infestation of sandwiches by bacteria, bugs, and other pathogenic organisms.
c) The epidemiologists found that, among people who ate sandwiches infested with viruses, the infection rate was no higher than among people who did not eat infested sandwiches.
d) The epidemiologists discovered that eaters who irradiated their sandwiches in a microwave thoroughly and sterilized the eating area were as likely to have infested sandwiches as were people who only dusted off their sandwiches.
e) The epidemiologists discovered that, for sandwiches left in the refrigerator for nine weeks, being left for longer durations did not correlate with a higher number of viruses being present.

This quesiton derives from this OG question:
https://gmatclub.com/forum/dental-resea ... 67378.html
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Re: At the Centers for Disease Control and Prevention, epidemiologists  [#permalink]

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03 Oct 2017, 10:54
At the Centers for Disease Control and Prevention, epidemiologists recently proved that sandwiches, even if left in refrigerators, can become infested with viruses that cause illness. They found that infestation usually occurs after sandwiches have been left for seven weeks. For that reason, people should discard leftover sandwiches at least once every seven weeks.

Which of the following, if true, would most weaken the conclusion provided?

Conclusion : people should discard leftover sandwiches at least once every seven weeks
Q type : weaken
Method : check for new information , which can undermine the conclusion.

a) The epidemiologists could not understand why infestation happened only after sandwiches were left for seven weeks, and not before.
OFS : out of scope ; we are concerned only with 'should be discard or not' , we are not concerned with details of infestation. ; incorrect
b) The epidemiologists did not research possible infestation of sandwiches by bacteria, bugs, and other pathogenic organisms.
OFS ; if sandwich was also infested with bugs along with viruses or only with viruses ; in both these cases , sandwiches must be discarded. ; no effect ; incorrect
c) The epidemiologists found that, among people who ate sandwiches infested with viruses, the infection rate was no higher than among people who did not eat infested sandwiches.
Correct ; virus is not causing illness.so, there is question mark.
d) The epidemiologists discovered that eaters who irradiated their sandwiches in a microwave thoroughly and sterilized the eating area were as likely to have infested sandwiches as were people who only dusted off their sandwiches.
OFS : from this we can only conclude that irradiation has no effect on viruses ; incorrect
e) The epidemiologists discovered that, for sandwiches left in the refrigerator for nine weeks, being left for longer durations did not correlate with a higher number of viruses being present.
Shell & game ; higher number of viruses does not mean higher infestation
Re: At the Centers for Disease Control and Prevention, epidemiologists &nbs [#permalink] 03 Oct 2017, 10:54
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