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There is a great deal of geographical variation in the frequency of ma

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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 16 Oct 2017, 10:14
demblr wrote:
Hi HKD1710

Thank you for your response. Do you have any other tips and tricks to recommend for CR?


Sure demblr, Here are the strategies:

1. Read PowerScore GMAT CR Bible OR MGMAT CR Guide if not done yet.
2. Do all the official questions available, While doing so keep making a note of what kind of answer choices (both correct & Incorrect) frequent. Also learn the patterns you see in ARGUMENTS and choices.
3. Master Prethinking/Paraphrasing.
4. Get better on Cause & effect OR Conditionals based CR questions. This will help you reduce the AVERAGE time taken for a CR questions.
5. Learn to Personalise the Arguments and connect them with a real world situation. This is really important in CR. GMAT CR questions are mostly real world arguments.
6. Do POE rather than looking for the right answer choice. Most of the time those weird looking answer choices are correct.

Just an Example:
Argument - There is a new fast food shop opening in the school. Children tend to obese eating fastfood. So children in school will get fat after the opening of the shop.

Now any kind of question be asked/made on this argument. Here are possible answer choices for specific questions.

Assumption - Author believes that Children are likely to eat at the restaurant.
Strengthen - Children are not given pocket money by their parents.
Weaken - This fast food chain has been awarded by the health ministry for coming up with fast food that is low on calories/FAT etc.

Hope it helps you :)
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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 27 Nov 2017, 01:28
MartinMag wrote:
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 55
Page: 138

There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.

To support a conclusion that much of the variation is due to unnecessary surgical procedure, it would be most important to establish which of the following?

(A) A local board of review to each hospital examines the records of every operation to determine whether the surgical procedure was necessary.

(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.

(C) There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily.

(D) For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.

(E) With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies, and tonsillectomies are representative of surgical procedures in general.

The below explanation is from David (Veritas Prep) -

This is a special type of the strengthen question where the conclusion is in the question stem. Please be on the lookout for this as it occurs fairly regularly.

The conclusion is "much of the variation is due to unnecessary surgical procedures" This indicates a cause and effect relationship. We are, in effect, saying that the reason that there is a geographical variation in the listed procedures is because in the areas where more procedures are performed many of those procedures are not necessary.

Now there could be other reasons for a variation in the number of surgeries. For example, the new natural gas wells that are being drilled in people's back yards have been proven to contaminate the water supply and so it would be very reasonable to see additional cases of cancer and therefore additional procedures near these poisonous wells. So that would be another cause not unnecessary procedures, but variations in the toxicity of various places around the U.S. (or the world depending on how you read the question).

In order to strengthen a question that involves cause and effect, you will want to consider the possibility of blocking an alternate cause. In this case we are saying the cause is the "unnecessary procedures" so we want to block the things that would make these procedures necessary - like variations in the age of the population, the health of the people, the quality of the water, even the ability of the people to pay for the procedures.

Answer Choice B does this. It says, "The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered." So this blocks the idea that the cause of varying rates of procedures would be any of the factors (age, health, toxins) etc. mentioned above. So we strengthen one cause by blocking another.

GMATNinja ,RonPurewal , sayantanc2k ,mikemcgarry ,daagh ,egmat ,EMPOWERgmatRichC ,
ChiranjeevSingh , AjiteshArun
other experts -- can you please help with a detailed explaination to eliminate other options!!
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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 27 Nov 2017, 03:20
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Skywalker18 wrote:
GMATNinja ,RonPurewal , sayantanc2k ,mikemcgarry ,daagh ,egmat ,EMPOWERgmatRichC ,
ChiranjeevSingh , AjiteshArun
other experts -- can you please help with a detailed explaination to eliminate other options!!
The stimulus says there is a great deal of geographical variation in the frequency of many surgical procedures. The many is important here. The stimulus is not saying that there is variation in the frequency of every possible procedure—just in "many". Then the stimulus tells us which procedures form the "many" (hysterectomies, prostatectomies, and tonsillectomies). If you're not sure about this, read the stimulus as "there is a lot of variation in the frequency of many surgical procedures—up to tenfold variation in A, B, and C procedures". The part after the dash limits the scope of the question. This is different from trying to change the "degree" with something like "there is a lot of variation in the frequency of many surgical procedures—and up to tenfold variation in A, B, and C procedures".

The conclusion is that this variation can be explained by unnecessary surgical procedures. We need to strengthen this, so the correct option will help us believe that unnecessary hysterectomies, prostatectomies, and tonsillectomies are being performed in some areas (more frequently than in others).

MartinMag wrote:
(A) A local board of review to each hospital examines the records of every operation to determine whether the surgical procedure was necessary.
This option says that there is (already) a local board of review at every single hospital. If such a board reviews surgical procedures to check whether they were necessary or not, we are LESS likely to believe that the variation is due to unnecessary surgical procedures.

Keep in mind that this option is not presenting us a recommendation. It tells us that such boards are already in place. Also, don't add any extra information (like "the boards are not functioning well").

MartinMag wrote:
(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.
This is good. The conclusion is that the variation is due to X. This option strengthens that conclusion by saying that the variation is unrelated to factors other than X (leaving only X to explain the variation).

MartinMag wrote:
(C) There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily.
This option (a) discusses procedures other than the ones the question is concerned with and (b) gives us no information about the link to geographical variation. If it had said that the same geographical variation is observed in other categories, we would have had some reason to think that the variation observed in the frequency of hysterectomies, prostatectomies, and tonsillectomies is due to unnecessary surgical procedures. But this option doesn't do that. It just says that there are other procedures that are often performed unnecessarily.

MartinMag wrote:
(D) For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
If this is true, all geographical regions should find the process equally difficult. There's nothing here to suggest that there is any geographical variation in the frequency of unnecessary surgical procedures. Also, this option doesn't really specify whether "certain" includes hysterectomies, prostatectomies, and tonsillectomies.

MartinMag wrote:
(E) With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies, and tonsillectomies are representative of surgical procedures in general.
Whether the three are representative or not is irrelevant. We first need to establish that the variation in the frequency of the three procedures is in fact due to unnecessary surgical procedures.
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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 02 Feb 2018, 17:50
This is how i understood the argument. Now the argument says that the variation in the number of people undergoing surgery is because of the geographical variation but the conclusion tells that the variation is due to the unnecessary procedure. Now we have to give a reason to prove the conclusion . Now can someone explain why B is correct . Thank you
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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 07 Mar 2018, 10:16
There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.

To support a conclusion that much of the variation is due to unnecessary surgical procedure, it would be most important to establish which of the following?

(A) A local board of review to each hospital examines the records of every operation to determine whether the surgical procedure was necessary. --It weakens the argument

(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered. --Correct. It removes the possibility that any other factor might impact the procedure

(C) There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily. --Out of scope

(D) For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded. --This weakens the argument

(E) With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies, and tonsillectomies are representative of surgical procedures in general. --Out of scope
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Re: There is a great deal of geographical variation in the frequency of ma [#permalink]

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New post 26 Mar 2018, 20:48
GMATNinja - how can you be sure this is a strenghtener question

When i read this, i thought this was an evaluate question ...an evalutate looks for strengtheners /weakeners in the same sentence
Re: There is a great deal of geographical variation in the frequency of ma   [#permalink] 26 Mar 2018, 20:48

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