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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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22 Mar 2015, 05:25
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veerdonjuan wrote:
I am unable to understand what the Option C is trying to explain. Can somebody help ?

aalokk wrote:
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.
(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.
(E) Polls about voting behavior typically have margins of error within plus or minus three percentage points.

hi veerdonjuan,
choice C is (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...
we have two different sets numbers..
1) in a survey conducted, 71% say that they cast votes. we do not know what constitutes of this group .. who all parcipated..
2) actual % is 60%..

now what C does is it tries to cover the gap by telling us that people who did not vote are less likely to respond to the survey...
since in the survey , the number of person not voted have not reponded, this has increased the % of people had voted..
hope it helped..
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In a recent poll, 71% of respondents reported that they cast  [#permalink]

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28 Mar 2016, 15:52
I still do not understand why the answer is C, can somebody please explain? Update: ok, I finally get it!
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In a recent poll, 71% of respondents reported that they cast votes in  [#permalink]

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10 Apr 2016, 01:47
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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.
B) Fifteen percent of the survey's 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 intent to do vote are prevented from doing so by last-minute conflicts on election day or other complications.
E) People are less likely to respond to a voting poll on the same day that they voted.

I fail to understand why the correct answer is correct and why not option D. Can someone please explain?
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Re: In a recent poll, 71% of respondents reported that they cast votes in  [#permalink]

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10 Apr 2016, 02:25
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optmistic2016 wrote:
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.
B) Fifteen percent of the survey's 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 intent to do vote are prevented from doing so by last-minute conflicts on election day or other complications.
E) People are less likely to respond to a voting poll on the same day that they voted.

I fail to understand why the correct answer is correct and why not option D. Can someone please explain?

Hi,
The first mistake You have done is TIMEFRAME when this survey was done..
It was done after the elections and NOT before..

71% say they had casted the vote, while ONLY 60% of those eligible had voted..
Why did more number of people say that they had casted the vote

lets see the choices CORRECT and D

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.
It says that people who voted actually become a part of this survey than people who do not vote..
Therefore if 200 people were eligible and 150 voted and 50 did not vote.. thus 75% voted..
But in survey 80% of those who voted took part as compared to 60% of those who did not vote..
so total surveyed= 0.8 * 150 +0.6 * 50 = 150..
people who said they voted = 0.8 * 150 = 120..
so % = 120/150 = 80%....
so 80% in survey agreed on voting whereas only 75% of total had voted..

D) Some people who intent to do vote are prevented from doing so by last-minute conflicts on election day or other complications.
These talks of people who had intention of voting BUt could not vote..
they are as it is not part of this survey in Q..

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

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10 Apr 2016, 04:39
chetan2u Thanks for the explanation - now option C makes sense but this is a very tricky question - what is the difficulty level?

Regarding option D, you mentioned about timeframe, but this is not explicitly mentioned that survey was done before the election or after?

'In a recent poll, 71% of respondents reported that they cast votes in the most recent national election." -> it doesnt state that survey was done prior or after - it states - recent survey, recent national elections.

Please clarify which point am I missing?
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Re: In a recent poll, 71% of respondents reported that they cast votes in  [#permalink]

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10 Apr 2016, 04:44
optmistic2016 wrote:
chetan2u Thanks for the explanation - now option C makes sense but this is a very tricky question - what is the difficulty level?

Regarding option D, you mentioned about timeframe, but this is not explicitly mentioned that survey was done before the election or after?

'In a recent poll, 71% of respondents reported that they cast votes in the most recent national election." -> it doesnt state that survey was done prior or after - it states - recent survey, recent national elections.

Please clarify which point am I missing?

Hi,
'In a recent poll, 71% of respondentsreported that they cast votes in the most recent national election."

If it was prior to elections, the sentence would be
'In a recent poll, 71% of respondents reported that they would cast votes in the most recent national election."

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

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11 Apr 2016, 01:37
Many thanks, now its crystal clear - I thought past tense of cast is casted - but after double checking it cast. So now it makes more sense - thanks for your support and explanation!
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Re: In a recent poll, 71% of respondents reported that they cast votes in  [#permalink]

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11 Apr 2016, 02:11
optmistic2016 wrote:
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.
B) Fifteen percent of the survey's 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 intent to do vote are prevented from doing so by last-minute conflicts on election day or other complications.
E) People are less likely to respond to a voting poll on the same day that they voted.

I fail to understand why the correct answer is correct and why not option D. Can someone please explain?

Option D talks about the people who have not casted the vote, whereas the survey is about the people who have casted the votes.Option C clearly explains the discrepancy by saying that people who vote are more likely to respond to the surveys. Hence the correct answer.
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Re: In a recent poll, 71% of respondents reported that they cast  [#permalink]

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31 May 2016, 21:37
mods pls update the question to remove answer from the text.
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Re: In a recent poll, 71% of respondents reported that they cast  [#permalink]

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31 May 2016, 23:31
This is a great question and the key to answering this question is to understand the data given in the premise.
60% of eligible voters voted -> this means that, of all of the people who were registered / allowed to vote, 60% of them voted.

The 71% refers to people who answered the poll,so we are talking about two different groups here. The poll surveyed some particular set of people , some of whom voted and some of whom did not vote. Some of the people polled may not even have been eligible to vote.
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Re: In a recent poll, 71% of respondents reported that they cast votes in  [#permalink]

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05 Jun 2016, 08:15
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60% of eligible voters voted -> this means that, of all of the people who were registered / allowed to vote, 60% of them voted.

The 71% refers to people who answered the poll.

So we are talking about two different groups here. The poll surveyed a particular set of people , some of whom voted and some of whom did not vote. Some of the people polled may not even have been eligible to vote.

Now Lets take the case that we have eligible voters as say 1000 - that means 600 of them voted.
The respondents can be the set of people who were eligible to vote and some people who were not eligible to vote - it could be figure more than 1000 or a figure less than 1000.

If the figure is more than 1000 then 71% of respondents would mean a figure of more than 710 but that is more than even the number of people who voted.
That would mean that the number of respondents should be a figure fewer than 1000 - and when is that possible - Option choice C is right on the mark when it says that the people who voted are more likely to be respondents i.e if more people who actually voted participated in the respondent poll and fewer people who did not vote were part of the survey.

Choice D talks about intention before the election but we know that the poll happened after the people actually voted - and hence it does not help us.

Choice E is a confusing answer but there are a few things that come to mind when we thing of choice E as a potential answer
- if some people actually got confused then the figure of respondents can go either way - more than 60% or less than 60%. We should have to make a few additional assumptions while choosing the answer.
Choice C is much better in this regard and hence is a better answer but for sure choice E does cause a lot of confusion in the head.

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

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06 Jun 2016, 11:21
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60% of eligible voters voted -> this means that, of all of the people who were registered / allowed to vote, 60% of them voted.

The 71% refers to people who answered the poll.

So we are talking about two different groups here. The poll surveyed a particular set of people , some of whom voted and some of whom did not vote. Some of the people polled may not even have been eligible to vote.

Now Lets take the case that we have eligible voters as say 1000 - that means 600 of them voted.
The respondents can be the set of people who were eligible to vote and some people who were not eligible to vote - it could be figure more than 1000 or a figure less than 1000.

If the figure is more than 1000 then 71% of respondents would mean a figure of more than 710 but that is more than even the number of people who voted.
That would mean that the number of respondents should be a figure fewer than 1000 - and when is that possible - Option choice C is right on the mark when it says that the people who voted are more likely to be respondents i.e if more people who actually voted participated in the respondent poll and fewer people who did not vote were part of the survey.

Choice D talks about intention before the election but we know that the poll happened after the people actually voted - and hence it does not help us.

Choice E is a confusing answer but there are a few things that come to mind when we thing of choice E as a potential answer
- if some people actually got confused then the figure of respondents can go either way - more than 60% or less than 60%. We should have to make a few additional assumptions while choosing the answer.

Choice C is much better in this regard and hence is a better answer but for sure choice E does cause a lot of confusion in the head.

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

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06 Jun 2016, 13:30
Prior research has shown that that people who actually do vote are also more likely to
respond to polls than those who do not vote. - this resolves the paradox by a simple mean:

71% respond stating they have voted but only 60% polling has happened. As per the above choice, 60% would have more likely responded "Yes" to the survey while the remaining 11% may be from the non-voting populace. Hence correct answer.
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Re: In a recent poll, 71% of respondents reported that they cast  [#permalink]

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11 Aug 2016, 23:20
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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30 Jan 2017, 10:33
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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15 Apr 2017, 00:59
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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15 Apr 2017, 10:10
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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26 Jun 2017, 09:43
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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26 Jun 2017, 10:05
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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27 Jun 2017, 08:25
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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