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by rocklikelei » Sat Apr 25, 2009 5:49 am
Which of the following most logically completes the passage?
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since .
A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
C. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis

I got stuck between C and D. Could anybody help? :)
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Source: — Critical Reasoning |

by mbadrew » Sat Apr 25, 2009 2:00 pm
The answer in my opinion is D.

A--choice goes outside the context of the arguement. There's no mention of other diseases in the passage.

B--the passage mentions misdiagnoses of those whom do have appendicitis and the scanner doesn't pick up. Think 98% correct, 2% incorrect but the patient has the problem.

It can't be C because the arguement clearly states that the patients diagnosed with this test have one or more symptoms of appendicitis and that there is a 2% margin of error. So ALL patients scanned may not show up as having appendicitis.

D--correct choice.

E. illogical. Why would someone get a scan for appendicitis if he/she doesn't present any sypmtoms.

I hope this helps.


Andrew
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by ManSab » Sat Apr 25, 2009 5:18 pm
mbadrew ... great reasoning.
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by 4seasoncentre » Sat Apr 25, 2009 10:04 pm
My guess is B.

Explanation is kinda long. Will elaborate if I'm right.
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by nicolette » Sun May 15, 2016 2:18 pm
I would pick D
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