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Finding of a survey of Systems magazine subscribers: Thirty

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Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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01 Oct 2008, 17:52
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66% (02:54) correct 34% (01:50) wrong based on 1978 sessions

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Finding of a suvey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in reponse to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?

A) More subscribers to Systems who have never ordered merchanise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five,

B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

D) Last year, the average dollar a mount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.

E) Last year many people who placed orders for merchandise in reponse to advertisements in Systems were not subscribers to the magazine.

[Reveal] Spoiler:
I got this question from the GMATprep. Please explain why your answer choise is correct and why the rest of the answer choices are wrong. Thanks!
[Reveal] Spoiler: OA

Last edited by tarek99 on 02 Oct 2008, 03:28, edited 2 times in total.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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01 Oct 2008, 22:32
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tarek99 wrote:
Finding of a suvey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in reponse to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?

a) More subscribers to Systems who have never ordered merchanise in response to advertisements in the magazine are age thirty-five was considerably lower last year than it is now.

b) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

c) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

d) Last year, the average dollar a mount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.

e) Last year many people who placed orders for merchandise in reponse to advertisements in Systems were not subscribers to the magazine.

I got this question from the GMATprep. Please explain why your answer choise is correct and why the rest of the answer choices are wrong. Thanks!

Orders placed = subscriber + non subscriber
If say 100 subscribers placed order & 30 of them were below thirty five.
If nonsub, who placed order, were 1000 & out of them 900 were below thirty five.
Now the total orders placed = 1100 & out of them 930 are from people below thirty five.

This makes both the statement stand true.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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02 Oct 2008, 00:17
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IMO E.

Stmt1: 30% order placed by Subscriber and less than 35 age people
Stmt2: Most of the order came from 'less than 35 age people'
Conclusion: Most is not all; however, if 500 people below 35 placed their order, only 150 people are subscriber and rest 350 people are NOT subscriber.
Hence, E is correct.

A: No info on present statistics
B: No info on present statistics
C: Opposite statement: Order actually placed by less than 35 age people mostly
D: Can't predict average \$ amount
E: IMO
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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02 Oct 2008, 01:09
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definitely E
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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02 Oct 2008, 01:16
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tarek99 wrote:
Finding of a suvey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in reponse to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?

a) More subscribers to Systems who have never ordered merchanise in response to advertisements in the magazine are age thirty-five was considerably lower last year than it is now. -> there is no mention of comparison between today and yesterday

b) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. -> same as above ELIMINATE
c) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. -> not suyre no where we know the proportion of orders by subscribers

d) Last year, the average dollar a mount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over. -> OOS

e) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. -> APT here since if this is true the above argument is correct i.e. we can say 30 % of subscribers orders wher by <35 age grp and also at the same time most of all the orders are by <35

I got this question from the GMATprep. Please explain why your answer choise is correct and why the rest of the answer choices are wrong. Thanks!

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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02 Oct 2008, 03:41
wow, you guys are good. The OA is E. I honestly couldn't see it. What difficulty level would you guys rate this question? I really struggled with this question type and I would need to practice more. Where would you suggest that I find such questions to practice with?

regards,
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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02 Oct 2008, 08:47
tarek99 wrote:
wow, you guys are good. The OA is E. I honestly couldn't see it. What difficulty level would you guys rate this question? I really struggled with this question type and I would need to practice more. Where would you suggest that I find such questions to practice with?

regards,

Try kaplan 800. Difficulty level is relative. If you figure it out then its easy & if you dont then its difficult. Neways I'd rate it average but good question. You're bound to see similar questions in actual GMAT.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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09 Feb 2010, 16:08
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Finding of a survey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in response to adverstisments in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under thirty-five.

For both of the findings to be accurate, which of the following must be true?

A.) More subscribers to Systems who have never order merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.

B.) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

C.) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

D.) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.

E.) Last year many people who placed orders in response to advertisements in Systems were not subscribers to the magazine.

[Reveal] Spoiler:
E

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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09 Feb 2010, 18:58
The catch in the question is whether all those who placed orders in response to advertisements, per 2nd statement, were subscribers and only E clarifies the situation.
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gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 03:33
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OA to follow
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 06:09
I would go for E. Explanation would follow if i am correct
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 07:59
I would go for E.....please post the OA....Tricky one that!!
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 08:18
Guys OA is Indeed E.

will really appreciate if you can explain your reasoning.

Thanks
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 08:24
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Expert's post
Yes, this is definitely E. The two surveys discuss different groups of people. The first is a survey of *subscribers* to the magazine. The second discusses *all* people who bought merchandise in response to magazine ads. Both claims can be true if a lot of under-35 non-subscribers bought merchandise, which is what E says.
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 08:42
IanStewart wrote:
Yes, this is definitely E. The two surveys discuss different groups of people. The first is a survey of *subscribers* to the magazine. The second discusses *all* people who bought merchandise in response to magazine ads. Both claims can be true if a lot of under-35 non-subscribers bought merchandise, which is what E says.

Hi Ian,

i am still confused..can you elaborate a bit more please.

Thanks
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Re: gmatprep CR - tricky one! [#permalink]

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01 Sep 2010, 21:34
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Hit and Run case ! The argument hits on one group and then starts talking about another group. The catch is 70% of merchandise orders can be placed by any of the 2 groups - over 35 yrs and exactly 35 yrs

30% of merchandise orders come from source X (subscribers)
70% of merchandise orders will come from different source. And composition of this group is unknown.

A cannot be necessarily true.
B cannot be inferred.
C makes a wrong assumption that over 35 yr group has placed more merchandise orders. What if the 35 yr group has placed most orders?
D is out of scope since we don't know the order value in different groups
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Re: gmatprep CR - tricky one! [#permalink]

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03 Sep 2010, 08:20
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I said (C). I don't understand how it can be (E) - you don't really have the information to determine how many non-subscribers placed orders, which is what (E) is talking about. For example, what if 100 subscribers placed orders, and 30 of them were under age 35, while only 5 non-subscribers placed orders, and 4 of them were under age 35? Then both findings are still correct, but (E) is false (unless we're going on some very arbitrary definition of "many").

(C) fits both findings the best. 70% of subscribers who placed orders were age 35 or over, a big majority. The only way to make (C) not true is if the number of non-subscribers who placed orders is larger than the number of subscribers who placed orders - and even then, you can't really determine whether or not the 30% of subscribers under 35 + the "most" of non-subscribers under 35 outnumber the 70% of subscribers + the remaining non-subscribers.

Really it seems like the question doesn't give you enough info to properly answer it, but I think (C) is a better answer than (E), given the assumptions you have to make to choose either one.
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Re: gmatprep CR - tricky one! [#permalink]

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03 Sep 2010, 10:11
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TehJay wrote:
I said (C). I don't understand how it can be (E) - you don't really have the information to determine how many non-subscribers placed orders, which is what (E) is talking about. For example, what if 100 subscribers placed orders, and 30 of them were under age 35, while only 5 non-subscribers placed orders, and 4 of them were under age 35? Then both findings are still correct, but (E) is false (unless we're going on some very arbitrary definition of "many").

No, you may have misinterpreted one of the two findings. The second finding says that most orders were placed by people under 35; that includes orders from both subscribers and non-subscribers. I think you are interpreting that finding to be about orders from non-subscribers only, but it's not. So in your hypothetical example, you have 105 orders in total, but still, only 34 orders come from people under the age of thirty-five. That isn't consistent with the second finding in the stem which tells us that most orders come from under-thirty-fives, so is not a possible scenario.

TehJay wrote:
(C) fits both findings the best. 70% of subscribers who placed orders were age 35 or over, a big majority. The only way to make (C) not true is if the number of non-subscribers who placed orders is larger than the number of subscribers who placed orders - and even then, you can't really determine whether or not the 30% of subscribers under 35 + the "most" of non-subscribers under 35 outnumber the 70% of subscribers + the remaining non-subscribers.

It's actually mathematically impossible for C to be true. Say you have S subscribers and N non-subscribers who placed orders. We know that 0.7S orders came from subscribers over thirty-five. Say you have X orders in total from non-subscribers over 35. We know from the second finding that less than half of all orders come from people over thirty-five, so:

(0.7S + X)/(N+S) < 1/2

But the proportion of all orders coming from subscribers over thirty-five is 0.7S/(N+S), and this is clearly less than the left side of the inequality above, so must be less than one half. So it's impossible for 'most' orders to have come from subscribers over thirty-five, and C cannot be true.
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Re: gmatprep CR - tricky one! [#permalink]

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04 Sep 2010, 11:28
Seeing it first time....these type of questions...Good one
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Re: gmatprep CR - tricky one! [#permalink]

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04 Sep 2010, 11:42
Findings of magazine: 30% of the orders placed by subscribers in response to advertisements were placed by subscribers under the age 35.

Findings of the advertiser: most of the orders placed in response to advertisements were placed by people under the age 35.

As already illustrated by nusmavrik the argument subtly shifts from subscribers to general population.

Most in advertiser's finding means >50%.

Let us assume total 100 orders were placed in response to advertisement in the magazine.
Therefore at least 50 people who ordered were under the age of 35 as per advertiser's finding.

In case all the above 100 people were subscribers of the magazine.
Which means only 30 people under the age of 35 placed the order.

It follows from above that orders placed by subcribers = total orders placed cannot be true, since advertiser's survey finding states that 50 people were under 35.
Moreover number of orders placed by subscribers cannot be more than total orders placed.

Therefore the orders placed by subscribers has to be less than the total number of orders,
==>ie. part of the orders were placed by non subscribers of the magazine.
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Re: gmatprep CR - tricky one!   [#permalink] 04 Sep 2010, 11:42

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