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GMAT:Punch Of the Week (14-April-09)

by Suresh

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What is "Punch Of The Week"?
  • Every week Learnhub's team will post one question each on Verbal Ability and Quantitative Ability of the GMAT Test Preparation

  • Members can post their answers along with explanations for the next one week.

  • After one week, Learnhub's team will post the official answer along with the explanation.Besides answering the previous week's questions, Learnhub's Team will come up with the next set of questions for that week as well.

What are the rules of "Punch Of The Week"?
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Photo 21678 Once the Learnhub's team posts the official answer along with the explanation, no comments must be made regarding those questions. In case of further clarification please send a personal message to the respective team member
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Photo 21678 Please bear in mind that only Learnhub's Team members have the privilege of posting questions here. Questions posted by other members will not be entertained and hence will be deleted immediately.
"Punch Of The Week" Team Members
Learnhub's Punch
This Week's Punches
Critical Reasoning

For a television program about astrology, investigators went into the street and found twenty volunteers born under the sign of Gemini who were willing to be interviewed on the program and to take a per sonality test. The test confirmed the investigators' personal impressions that each of the volunteers was more sociable and extroverted than people are on average. This modest investigation thus supports the claim that one's astrological birth sign influences one's personality.

Which one of the following, if true, indicates the most serious flaw in the method used by the investigators?

(A) The personality test was not administered or scored personally by the investigators.

(B) People born under astrological signs other than Gemini have been judged by astrologers to be much less sociable than those born under Gemini.

(C ) The personal impressions the investigators first formed of other people have tended to be confirmed by the investigators' later experience of those people.

(D) There is not likely to be a greater proportion of people born under the sign of Gemini on the street than in the population as a whole.

(E) People who are not sociable and extroverted are not likely to agree to participate in such an investigation.

Problem Solving

How many of the positive factors of 840 are divisible by 4?

A.4

B.8

C.16

D.32

E.None of these

Click here for last week's Punch and explanatory answers for the same

Posted on 20-April-09

So,folks here are the correct answers

Critical Reasoning
The correct answer is E. The argument generalizes from a sample to the general population. To weaken it, we must show that the sample is not representative of the general population. Now if only sociable and extroverted people are likely to submit to an interview, then the sample would not represent the general population. The answer, therefore, is (E).

Don't make the mistake of choosing (D). Although it addresses the issue of the representativeness of the sample, it actually strengthens the argument by showing that the sample is typical of the general public.
Problem Solving
The correct answer is C.

We want a factor of 840 which is in the form 4×. Since 4x must divide 840, it is evident that x must divide 210. So the question is all about calculating the factors of 210.
210=2 X 3 X 5 X 7
Hence the total number of factors of 120 = 2×2×2x2 = 16

Click here for the next week's Punch


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12 Comments
    Sureshbala
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    SureshSat, 02 May 2009 12:04:06 -0000

    Hi,

    Thanks for the correction. I made the necessary changes in the lesson

    Regards

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    rneve
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    Raju NeveMon, 20 Apr 2009 07:31:30 -0000

    Hi Suresh ,

    In the second ( problem solving ) explanation , I think x must divide 210 rather than 120.
    ( since 840 / 4 = 210 ). If we factorize 210 = 2 * 3 * 5 * 7 . We get 2*2*2*2 = 16 factors
    ( So ans does is 16 ).

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    Sureshbala
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    SureshMon, 20 Apr 2009 05:57:15 -0000
    So,folks here are the correct answers

    Critical Reasoning
    The correct answer is E. The argument generalizes from a sample to the general population. To weaken it, we must show that the sample is not representative of the general population. Now if only sociable and extroverted people are likely to submit to an interview, then the sample would not represent the general population. The answer, therefore, is (E).

    Don’t make the mistake of choosing (D). Although it addresses the issue of the representativeness of the sample, it actually strengthens the argument by showing that the sample is typical of the general public.
    Problem Solving
    The correct answer is C.

    We want a factor of 840 which is in the form 4×. Since 4x must divide 840, it is evident that x must divide 120. So the question is all about calculating the factors of 120.
    120=2^3 X 3 X 5
    Hence the total number of factors of 120 = 4×2×2 = 16

    %{font-size:20px}"*Click here for the next week's Punch%*":http://learnhub.com/lesson/11928-gmatpunch-of-the-week-20-april-09

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    himyadav
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    Himanshu YadavSun, 19 Apr 2009 05:43:48 -0000

    Answer to CR question is E.

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    rindam2008
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    rindam2008Sat, 18 Apr 2009 15:12:46 -0000

    answer for cr is E

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    Harikishore
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    M V S Hari KishoreThu, 16 Apr 2009 15:45:48 -0000

    Answers for CR is (E) is obvious..The method of finding the representative sample by investigators is not correct as reflected in (E).

    Excellent explanation by Chetan2u for the PS question. Good to have somebody like him on the forum

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    arvind70
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    arvind70Thu, 16 Apr 2009 06:20:45 -0000

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    jaskyac
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    Jasmine NguyenWed, 15 Apr 2009 17:14:51 -0000

    CR: E
    PS: 16

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    deus
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    pragesh satijaWed, 15 Apr 2009 11:43:51 -0000

    CR - E
    PS - 16

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    chetan2u
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    chetanWed, 15 Apr 2009 11:05:22 -0000

    cr-e and ps-c.. prime factors of 840=6 i.e. (2)(2)(2)(3)(5)(7)…… to find factors divisible by 4: 840 can be written as (4)(2)(3)(5)(7)…….
    find combination of 4 digits-2,3,5,7( as 4 can be multiplied with one or more of the digits)
    single digits-4c4;two digits-4c3..lly 4c2 n 4c1
    total=4c4+4c3+4c2+4c1=1+4+6+4=15
    n ofcourse not to forget 4 alone therefore total 16 i.e. c ans

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    i_m_wat_i_m
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    Pallav BhadauriaWed, 15 Apr 2009 10:16:33 -0000

    For the CR i think its E and for problem solving it C

    problem solving:

    The factors of 840 are 2*2*2*3*5*7 now if the number is to be divisible by 4 then it should be having factor 2*2 , leaving the factors as

    2^(power)2 [2*3*5*7] all these factors can be choosen in 2^4 ways giving 16 as the answer

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    daagh
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    NarendranWed, 15 Apr 2009 09:20:59 -0000

    Answer for CR

    E) People who are not sociable and extroverted are not likely to agree to participate in such an investigation.

    For investigations of such sort, the attributes should be chosen by the random method. One can not select first Geminians and then those among them who are willing to be interviewed on the program and then conclude that they are more sociable and extroverted than people are on average. And more sociable than “whom”? The other arm of the comparison is missing and so the survey has a serious flaw of illogical methodology

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Sureshbala
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Last Updated At Dec 13, 2012
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