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The number of people diagnosed as having a certain bacterial

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The number of people diagnosed as having a certain bacterial [#permalink] New post 20 Oct 2010, 00:57
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Difficulty:

  35% (medium)

Question Stats:

68% (02:39) correct 32% (01:39) wrong based on 188 sessions
The number of people diagnosed as having a certain bacterial infection has dropped significantly in a rural county this year, as compared to last year. Health officials attribute this decrease entirely to improved sanitary conditions at water-treatment plants, which made for cleaner water this year and thus reduced the incidence of the disease.

Which of the following, if true, would most seriously weaken the health officials’ explanation for the lower incidence of the disease?

(A) Many new water-treatment plants have been built in the last five years in the rural county.
(B) Bottled spring water has not been consumed in significantly different quantities by people diagnosed as having the bacterial infection as compared to people who did not contract the disease.
(C) Because of a new diagnostic technique, many people who until this year would have been diagnosed as having the bacterial infection are now correctly diagnosed as suffering from intestinal ulcers.
(D) Because of medical advances this year, far fewer people who contract the bacterial infection will develop severe cases of the disease.
(E) The water in the rural county was brought up to the sanitary standards of the water in neighboring counties ten years ago.
[Reveal] Spoiler: OA
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Re: bacterial infections diagnosis puzzle [#permalink] New post 20 Oct 2010, 08:54
A?
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Re: bacterial infections diagnosis puzzle [#permalink] New post 20 Oct 2010, 11:33
Straight C.

This is because C provides an alternate reason for why lesser people are diagnosed with certain bacterial infection this year, compared to last year.
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Re: bacterial infections diagnosis puzzle [#permalink] New post 22 Oct 2010, 16:13
C.

But B is tricky to eliminate. Good question.
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Re: The number of people diagnosed as having a certain bacterial [#permalink] New post 19 Nov 2014, 11:16
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IMO c... A option was a bugger.. but u can eliminate it by using the keyword "NEW water ...." its talking about new. While in the stimulus nothing is mentioned about NEW. Took me almost 3 min to eliminate option A.
Tip: When ur stuck with two options, dont try to think which one is better but try to think which one is wrong. Find that small clue that changes the entire picture.
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Re: The number of people diagnosed as having a certain bacterial [#permalink] New post 19 Nov 2014, 11:47
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rishabhmudgal wrote:
IMO c... A option was a bugger.. but u can eliminate it by using the keyword "NEW water ...." its talking about new. While in the stimulus nothing is mentioned about NEW. Took me almost 3 min to eliminate option A.
Tip: When ur stuck with two options, dont try to think which one is better but try to think which one is wrong. Find that small clue that changes the entire picture.

Always keep a careful eye for the scope of the question and each answer--that will let you eliminate tempting traps without losing time on the clock. In this case, notice how the events discussed in the prompt are "this year...compared to last year." That makes it unlikely that an answer covering all of "the last five years" will provide a satisfactory weakener.

Hope this helps!
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Re: The number of people diagnosed as having a certain bacterial [#permalink] New post 17 Mar 2015, 17:34
Explanation for choice C

Type: weaken

Conclusion: cleaner water => reduce incidence of disease

Assumption: cleaner water is the only reason

Weaken: there are other explanations for the drop in Bacterial infection. Choice C indicates one of these explanations
Re: The number of people diagnosed as having a certain bacterial   [#permalink] 17 Mar 2015, 17:34
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