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# (Un) Scientific analysis of gmatprep

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CEO
Joined: 17 Nov 2007
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Kudos [?]: 2294 [1] , given: 359

Re: (Un) Scientific analysis of gmatprep [#permalink]  05 Jun 2008, 23:13
1
KUDOS
Expert's post
Bsd_lover, thanks for your experiments!!! +5

It would be great if you just continue this work and finish with a solid conclusion (especially in Verbal )
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Re: (Un) Scientific analysis of gmatprep [#permalink]  06 Jun 2008, 06:23
1
KUDOS
bsd one request.Just get all Rc correct with an avg of sc n Cr...then what happens.is it again a s low as 13 or so?Kudos dude.
Manager
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Re: (Un) Scientific analysis of gmatprep [#permalink]  06 Jun 2008, 18:26
1
KUDOS
yeah and a good experiment would be to get all rc right and the rest wrong... and then see how the verbal score shapes up... kind of like you did for SC and CR. Kudos!
Director
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Re: (Un) Scientific analysis of gmatprep [#permalink]  06 Jun 2008, 19:17
1
KUDOS
I concur...I usually have a 44-45 quant and always have the boldface as my first question.
Manager
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Re: (Un) Scientific analysis of gmatprep [#permalink]  06 Jun 2008, 19:47
1
KUDOS
Boy! What would we all do without you around here, bsd_lover! Man, awesome analysis and great contributions from Suyashjhawar too. Thanks guys. It goes without saying that this masterpiece deserves a (+1)..Gotta bookmark this one! Is it worth a sticky and moving this thread upto a place where everyone can easily access this. The Mods have to determine that, I guess.
Director
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Re: (Un) Scientific analysis of gmatprep [#permalink]  07 Jun 2008, 22:12
1
KUDOS
Remember having read this in some earlier discussion. That if you finish that Quant section much ahead of time, your initial Verbal questions are extremely difficult. How true is that ??
Intern
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Re: (Un) Scientific analysis of gmatprep [#permalink]  08 Jun 2008, 04:54
1
KUDOS
this is just fantastic, kudos!

pls continue your second experiment on getting first 20 questions correct and remaining 17 wrong....this experiment will help us to calculate the time that we can spend on first few questions.
GMAT Instructor
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Re: (Un) Scientific analysis of gmatprep [#permalink]  08 Jun 2008, 06:16
1
KUDOS
Don't read too much into getting a BF in GmatPrep. BF are no more difficult than other CR questions. I am sure that GMAC does not choose the first verbal question on the basis of the quant score.
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Re: (Un) Scientific analysis of gmatprep [#permalink]  08 Jun 2008, 07:44
1
KUDOS
One of the problems with figuring out the algorithm with your methodology is that the order of the questions changes. Imagine if you got 5 sentence corrections in a row and you missed all of them it is going to appear like Scs are more important. The scoring doesn't differentiate the question type only the level of the question.
Current Student
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Re: (Un) Scientific analysis of gmatprep [#permalink]  08 Jun 2008, 09:32
1
KUDOS
guys..my advice to you all is to take every question as if your life depends on it..get it correct..thats the winner's attitude..

everyone of should aim to get 51 on Q and 51 on V...

thats the winning attitude..

thats the key to success..each and everyone of us is capable of this feat..

just remember you have 2 mins/question..thats the discipline you need..
GMAT Tutor
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Re: (Un) Scientific analysis of gmatprep [#permalink]  25 Aug 2008, 11:26
1
KUDOS
Expert's post
There is a danger in drawing conclusions from a small sample size. I agree with Kevin that your Quant performance will have no effect at all on the questions you see in the Verbal section- the test would be unfairly biased if it did- and I expect what bsd noticed was just coincidence.

It is also untrue that SC questions are 'worth more' than CR questions, or vice versa, though I do agree that it's easier to improve on SC than on CR, so it is a good area to focus on during preparation for the test. I do suspect virflo is right in saying that RC questions come in batches- with one passage, some questions will be easier than others, though certainly some RC sets will be harder overall than other RC sets. As a consequence, it may be true that some RC questions are less important than others- those that are far from your ability level.

I do not agree at all with bsd's conclusion about the first ten questions, and take issue with the methodology. If you guess at the first 10 questions, and answer 2 correctly, that is an absolutely horrific performance. That's exactly how well you'd expect a ham sandwich to do on the first ten questions, by guessing. Since you're more than a quarter way through the test at that point, you don't have much time to recover. In addition, since only between 23 and 30 questions actually count (because of the presence of diagnostic questions), you may be more than one third into your test after ten questions. In any case, the conclusion is not relevant to any of us, since none of us will answer 8 of the first 10 questions incorrectly, unless we are genuinely sub-300 scorers on the GMAT. Yes, you can conclude from the result that it's a bad idea to guess at the first 10 questions, but I don't think that should come as any surprise. I agree entirely with terp, that the best strategy is to do as well as possible on every question, and it is certainly true that a series of bad answers at the end of a test can absolutely kill your score.
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Re: (Un) Scientific analysis of gmatprep [#permalink]  07 Jul 2009, 13:25
1
KUDOS
I have conducted similar experiments too.

My observations:
For Quants getting as many (~20-25) initial question correct helps boost the score. However this does not hold true in case of Verbal. If we were to believe that the GMAT is truly adaptive test, that questions get harder as you answer correctly and that the harder questions carry higher weight, then this whole scheme seems to fall apart for Verbal.
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Re: (Un) Scientific analysis of gmatprep [#permalink]  23 Jul 2009, 06:17
1
KUDOS
The Manhattan GMAT people have done their own analysis on this concept as well:

http://www.manhattangmat.com/gmat-prep- ... -annex.cfm
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Manager
Joined: 11 Mar 2010
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Re: (Un) Scientific analysis of gmatprep [#permalink]  23 May 2010, 01:45
1
KUDOS
great post buddy.

I'm wondering. I kaplan free practice test, I got 4 incorrect in quant. it showed 45 scaled score. I was expecting atleast 49 here, but my first question was wrong. Does 1st incorrect answer scale down your score 4 points? or is just kaplan's strategy to enroll me for the course?
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Re: (Un) Scientific analysis of gmatprep [#permalink]  31 May 2010, 23:01
1
KUDOS
Expert's post
And also to build on top of this, the algorithm of GMATprep is not the same as the real GMAT (though very similar in terms of evaluating your abilities but not as through).

Many believe this was done to prevent reverse engineering.

MBAUncle wrote:
Tarun, the scoring algorithm in PowerPrep is completely different from that of the GmatPrep. I got only one question wrong in Q but the PP gave me only 50.
Although PowerPrep is good for studying in an early phase, its questions no longer represent the current GMAT, which is then more similarly represented by the GmatPrep.

tarun wrote:
My 2 cents observation with Powerprep.

I gave 2 test of powerprep.

Test 1 - Score 690, Q 49, V 34
7 Quant questions were answered incorrectly - 7, 8, 9, 11, 30, 32, 35
13 Verbal questions were answered incorrectly - 3, 9, 16, 17, 19, 20, 21, 23, 31, 33, 38, 40, 41

Test 2 - Score 690, Q 49, V 34
5 Quant questions were answered incorrectly - 5, 11, 14, 19, 36
8 Verbal questions were answered incorrectly - 1, 6, 11, 13, 19, 29, 34, 38

With less incorrect answers in test 2, I guess I should have scored higher. But then carefully observing the number of incorrect answers till question number 5, 10, 15 and 20, it seems that the score is almost finalized till ques number 20. Accuracy beyond that does not have much impact on the score.

Posted from my mobile device

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Manager
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Re: (Un) Scientific analysis of gmatprep [#permalink]  05 Aug 2010, 23:06
1
KUDOS
Guys one very good observation...

funda to get 51 on GMAT (atleast tested on GMATPREP) never to get two continuous questions wrong...even with 5-6 overall wrong one can get a score of 51. Same number of mistakes and at same time with only 1 continuous set wrong will lead to 50
Manager
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Kudos [?]: 30 [1] , given: 5

Re: (Un) Scientific analysis of gmatprep [#permalink]  06 Oct 2010, 22:20
1
KUDOS
smartmundu wrote:
Guys one very good observation...

funda to get 51 on GMAT (atleast tested on GMATPREP) never to get two continuous questions wrong...even with 5-6 overall wrong one can get a score of 51. Same number of mistakes and at same time with only 1 continuous set wrong will lead to 50

No, I just did GMATPrep #2 (2nd try) and got a Q51 with numbers 28 and 29 wrong (missed 3 out of 37 total). This is the first time I've scored Q51; every other time was Q50.

So far I've found Q50 on my GMAT's every time I get 6-7 quant questions wrong, which is quite a few when you consider that 31/37 is 83.7% correct.

I've done much better on the Verbal parts, even scoring a V51 once (3rd try on GMATPrep #1). V51 resulted from scoring 100%; V48 from answering 1 verbal question (#10) wrong; V47 and V48 from answering 2 verbal questions wrong (both later on, in the 20's-40's), and V42 from answering 6 wrong.

Overall I'm not too worried about the verbal score. Although it is pretty picky, needing to get every single one right to score a 51, it's overall easier imo than the quant section, and the percentile skew is better (V46 is 99%ile). I wish they scored quant and verbal evenly; it seems that you can miss 3-4 per section and still score within the 99th percentile.
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Re: (Un) Scientific analysis of gmatprep [#permalink]  12 Mar 2013, 03:04
1
KUDOS
sns wrote:
If you are running out of time, which is worse - doing each of the remaining questions to the best of your ability, try to get them all right and leave the rest? Or do quick guesstimates and try to at least attempt all the questions? Which has more severe penalty - an incomplete test or a string of wrong answers at the end?

Never leave questions. Each un-attempted question translates to (roughly) a 3 percentile drop in the score. So the penalty to leave questions unanswered is severe.

Cheers
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Re: (Un) Scientific analysis of gmatprep [#permalink]  05 Jun 2008, 06:23
terp26 wrote:
solution: get every question right

Alas, if it were only that easy
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Re: (Un) Scientific analysis of gmatprep [#permalink]  05 Jun 2008, 06:25
This type of analysis is priceless! bsd_lover, please keep up the testing. If you can post a detailed account of your methodology, others of us can also experiement and provide results to you in a sreadsheet, or screen shot of the right/wrong questions on the review page for the GMATPrep.

I agree with everyone here. The nature of the way CAT works is it's biggest vulnerability. A certain question at one point of the test IS weighted differently than the same question at another point in the test. For example, say Question A is a Level 45 question. It makes sense that this is so, because if you get Question A as the # 27 question once, it has 26 other questions to analyze with your response to that question vs. if you get Question A as the #2 question. Your correct answer to Question A at #2 should impress the CAT more than getting it right at #27, but again, much of how impressed the CAT is depends upon the level of questions received prior to getting Question A.
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Re: (Un) Scientific analysis of gmatprep   [#permalink] 05 Jun 2008, 06:25

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# (Un) Scientific analysis of gmatprep

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