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In a recent poll, 71% of respondents reported that they

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Re: In a recent poll, 71% of respondents reported that they cast [#permalink]

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New post 25 Jun 2016, 12:17
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Re: In a recent poll, 71% of respondents reported that they cast [#permalink]

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New post 11 Aug 2016, 22:20
In a recent poll, 71% of respondents reported that they cast votes in the most recent national election. Voting records show, however, that only 60% of eligible voters actually voted in that election.

Total 100 voters
71 casted vote 29 didnt. (claimed)

1> eligible voters x => x*60 /100 = 71 x =118 which cant be the case. maximum they could be 100 or less. we dont know how many
2> or 71 who claimed, only 60 actually voted (considering x=100). 11 were either not eligible or lying.

Which of the following pieces of evidence, if true, would provide the best explanation for the discrepancy?


(B) Fifteen percent of the surveys respondents were living overseas at the time of the election.
(C) Prior research has shown that people who actually do vote are also more likely to respond to polls than those who do not vote.
(D) Some people who intend to vote are prevented from doing so by last minute conflicts on election day or other complications. : even if they didn't, then why it is 60 instead of 71 who claimed that they voted..

I will go with C.

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Re: In a recent poll, 71% of respondents reported that they cast [#permalink]

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New post 30 Jan 2017, 09:33
Just to share another good reasoning.

(a) The margin of error is not substantial enough to account for the 11% discrepancy.
(b) Citizens outside the territories are just as eligible to vote and thus, they would have cast their vote via mail.
(d) Even if the last minute glitch prevented many individuals from voting, the poll was conducted AFTER the voting process. Thus, those who had been eliminated or prevented from the voting process would have responded with a negative to the poll.
(e) There is no reason to assume that there were more than a single election being held.

Finally, why (c). Well the data suggesting that 60% of those eligible voted is accurate. It is not subject to sampling errors. However, the Poll's suggested numbers are contingent on the number of responders and how accurately the poll's sample space represents the actual sample space.


credit to : kapil.chhabria
Reference : https://www.manhattanprep.com/gmat/foru ... t6511.html

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In a recent poll, 71% of respondents reported that they [#permalink]

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New post 14 Apr 2017, 23:59
In a recent poll, 71% of respondents reported that they cast votes in the most recent national election. Voting records show, however, that only 60% of eligible voters actually voted in that election.

Which of the following pieces of evidence, if true, would provide the best explanation for the discrepancy?

A. The margin of error for the survey was plus or minus five percentage points.
(Margin of error, bingo! Excellent. So the real percentage could’ve been anywhere from…71% + 5% to 71% − 5%, which is still 66%. This doesn’t go far enough. Still, it’s about margin of error. I’m going to keep this one and come back to it later.)
B. Fifteen percent of the survey's respondents were living overseas at the time of the election.
(This percentage is larger than the 11% discrepancy mentioned in the argument. But what group are they talking about? Are these the people who did vote, or didn’t vote, or some mix of the two? And what does “living overseas” imply? This country might allow people to vote by absentee ballot. This doesn’t resolve anything.)
C. Prior research has shown that people who actually do vote are also more likely to respond to polls than those who do not vote.
(What does that mean? Of the people who responded, more were likely to have been voters than is represented in the overall population. Oh, I see - the survey was skewed towards those voted. That's why 71% of that sub-group could have voted why only 60% of the overall population of eligible voters voted. That's better than A - I will get rid of A.)
D. Some people who intend to vote are prevented from doing so by last-minute conflicts on election day or other complications.
(I’m sure this is true in the real world. How does it affect this argument? The survey took place after the election; it asked people whether they had voted in the past. It doesn’t address what people intended to do before the election)
E. People are less likely to respond to a voting poll on the same day that they voted.
(We have no idea when the poll was taken, so I can't do much with this. Even if the poll were done the same day as the election, this just highlights the discrepancy - it's even more puzzling now. I would expect the percentage of people who said they voted to be lower than the real percentage because those who didn't vote that day would be more likely to agree to participate in the poll.)

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Re: In a recent poll, 71% of respondents reported that they [#permalink]

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New post 15 Apr 2017, 09:10
Option "C" clearly states that the sample is biased as more of it (the sample) is composed by people who did vote than people who dit not. So extrapolating from the sample results would not be an accurate estimation within an "acceptable" margin of error.

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Re: In a recent poll, 71% of respondents reported that they cast votes in [#permalink]

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New post 26 Jun 2017, 08:43
if ones read the passage carefully, they will understand why D is wrong. The reason behind it is because D discusses about the people who do not actually vote, not about people who will not vote.

C explains why the number of people who vote in poll is higher than in reality.

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Re: In a recent poll, 71% of respondents reported that they [#permalink]

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New post 26 Jun 2017, 09:05
Merged topics. Please, search before posting questions!
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Re: In a recent poll, 71% of respondents reported that they [#permalink]

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New post 27 Jun 2017, 07:25
Hi please explain why option D is wrong .
If people somehow did not vote in the last election but they vote regularly will d not follow?
Please tell what is the fault in my reasoning.
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Re: In a recent poll, 71% of respondents reported that they [#permalink]

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New post 07 Jan 2018, 00:07
Can someone help me with this tricky question. Now this is how i evaluated the question.Lets say there are 1000 total members in a village , of which 60% = 600 have actually voted and that the poll results show that there are 71%=710 who have participated in the poll saying that they will vote in the recent election. Im not really understanding from here how do i evaluate the question . Kindly help.

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Re: In a recent poll, 71% of respondents reported that they   [#permalink] 07 Jan 2018, 00:07

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