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LOGICALLY COMPLETES......

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nandy1984 Really wants to Beat The GMAT! Default Avatar
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LOGICALLY COMPLETES...... Post Sat Mar 31, 2012 11:31 am
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  • Lap #[LAPCOUNT] ([LAPTIME])
    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 always 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

    Please explain how to solve this... Too much info to digest...

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    killer1387 GMAT Destroyer! Default Avatar
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    Post Sat Mar 31, 2012 9:58 pm
    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 always 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 ____________.

    B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it


    Basically the info that will fill the blank is the one that suggests why in spite of using the internal scan the number of surgery performed will not decrease. We need some information regarding the misdiagnosed case. B here fill the gap saying the misdiagnosed cases are infact not the misdiagnosed ones; they actually dont have appendicitis. hence the number actually infected is not reduced and hence the necessary removals will not decrease.

    Hence B.

    OA??

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    Bill@VeritasPrep GMAT Instructor
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    Post Sat Mar 31, 2012 10:23 pm
    I would go with B as well. If the misdiagnoses are always diagnosing appendicitis when the patient doesn't actually have it (leading to an unnecessary appendectomy), then there are no situations where appendicitis is not diagnosed in a patient who does have it. This means that everyone who actually needs an appendectomy will get one ("without performing any fewer necessary ones").

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    Last edited by Bill@VeritasPrep on Sun Apr 01, 2012 12:54 am; edited 1 time in total

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    nandy1984 Really wants to Beat The GMAT! Default Avatar
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    Post Sun Apr 01, 2012 12:30 am
    killer1387 wrote:
    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 always 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 ____________.

    B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it


    Basically the info that will fill the blank is the one that suggests why in spite of using the internal scan the number of surgery performed will not decrease. We need some information regarding the misdiagnosed case. B here fill the gap saying the misdiagnosed cases are infact not the misdiagnosed ones; they actually dont have appendicitis. hence the number actually infected is not reduced and hence the necessary removals will not decrease.

    Hence B.

    OA??
    answer is B... I could not understand the wording in the last sentence of the argument as well as the answer choice B... Can you explain it bit clearly... Thanks....

    agarwalmanoj2000 Rising GMAT Star Default Avatar
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    Post Mon Apr 02, 2012 2:23 am
    Quote:
    answer is B... I could not understand the wording in the last sentence of the argument as well as the answer choice B... Can you explain it bit clearly... Thanks....
    Out of 100 operation performed before 80 were necessary operations and 20 not necessary operations. The last part says that number of necessary operation will not be less than 80.

    Option B explains that misdiagnosis will result in 2 extra operations in 100 cases, so number of necessary operation will increase to 82.

    HTH.

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