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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 [#permalink]

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New post 20 Apr 2014, 05:59
Hi - I am having such a tough time understanding the solution to this problem. I understand why the wrong answers are wrong, but can't seems to grasp why C is the right answer. Please could anyone help break it down for me? Thank you so much ahead for your help.


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 show that people who actually do vote are also more likely to respond to poll 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. People are less likely to respond to voting poll on the same day that they voted

Last edited by SavedByNazar on 21 Apr 2014, 07:20, edited 2 times in total.
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Hi SavedByNazar, Your option (C) wording is incorrect. please verify.

Difference is 11%, but it’s not actually mathematical difference. So, we can’t subtract the different in this way. Total Number of people who responded to pole (P) and Total number of eligible voters (V) are different. Pole is usually done for statistical sampling to predict the outcome. Pole and actual voting have different number of people.

71% of total respondent said, they casted vote.
But, 60% of total eligible voters actually voted.
So, this means, there were more percentage of people involved in pole response, than percentage of people who actually voted.

In Other words,
29% of total respondent said, they didn’t vast vote
But, 40% of total eligible voters didn't vote.
Out of number of people who didn’t actually cast vote (40%), few of them, didn’t think responding to pole. It means, People who voted, responded to pole more pro actively.

Above understanding helps to resolve the discrepancy.

Option wise explanation, though you understood:

A. The margin of error for the survey was plus or minus five percentage points. Total number of people in both cases is not same.This option doesn’t help to resolve the discrepancy.
B. Fifteen percent of the survey's respondents were living overseas at the time of the election. This doesn’t talk about people who voted.
C. 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 looks more justifiable reason and more generic reason behind this discrepancy.So, correct !
D. Some people who intend to vote are prevented from doing so by last-minute conflicts on election day or other complications.This doesn’t help to distinguish the percentage of people who didn’t vote along with percentage of people who missed to respond in pole. Hence, can’t resolve discrepancy.
E. People are less likely to respond to voting poll on the same day that they voted. This doesn’t talk about people - how many and which people were less likely to respond to pole.

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New post 21 Apr 2014, 07:33
Hi sorry - i had a type in my post. Thank you so much for the following. I still can't seem to understand why C fits the puzzle. Here's how I am thinking about it. Could you pleast let me know where I am going wrong? Thanks ahead for the help!!

In town A there are 100 people. Out of those only 60 are eligible to vote. So that would mean that 71 of the people in town A said that they would vote. And only 36 (60% of 60) actually voted. Per answer choice C, it is likely that all the 36 that voted, responded to the poll. But how does this explain the discrepancy?

umeshpatil wrote:
Hi SavedByNazar, Your option (C) wording is incorrect. please verify.

Difference is 11%, but it’s not actually mathematical difference. So, we can’t subtract the different in this way. Total Number of people who responded to pole (P) and Total number of eligible voters (V) are different. Pole is usually done for statistical sampling to predict the outcome. Pole and actual voting have different number of people.

71% of total respondent said, they casted vote.
But, 60% of total eligible voters actually voted.
So, this means, there were more percentage of people involved in pole response, than percentage of people who actually voted.

In Other words,
29% of total respondent said, they didn’t vast vote
But, 40% of total eligible voters didn't vote.
Out of number of people who didn’t actually cast vote (40%), few of them, didn’t think responding to pole. It means, People who voted, responded to pole more pro actively.

Above understanding helps to resolve the discrepancy.

Option wise explanation, though you understood:

A. The margin of error for the survey was plus or minus five percentage points. Total number of people in both cases is not same.This option doesn’t help to resolve the discrepancy.
B. Fifteen percent of the survey's respondents were living overseas at the time of the election. This doesn’t talk about people who voted.
C. 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 looks more justifiable reason and more generic reason behind this discrepancy.So, correct !
D. Some people who intend to vote are prevented from doing so by last-minute conflicts on election day or other complications.This doesn’t help to distinguish the percentage of people who didn’t vote along with percentage of people who missed to respond in pole. Hence, can’t resolve discrepancy.
E. People are less likely to respond to voting poll on the same day that they voted. This doesn’t talk about people - how many and which people were less likely to respond to pole.

+1 Kudo is best way to say thanks, if it helps :)
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Re: In a recent poll, 71% of respondents reported that they [#permalink]

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New post 08 Oct 2014, 18:08
C simply becoz C indicates that there were people in the survey who said that they voted but actually could not
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Re: In a recent poll, 71% of respondents reported that they cast [#permalink]

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New post 22 Mar 2015, 03:24
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.

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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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New post 28 Mar 2016, 14:52
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 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.

[Reveal] Spoiler:
I fail to understand why the correct answer is correct and why not option D. Can someone please explain?
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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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New post 10 Apr 2016, 03:39
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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New post 10 Apr 2016, 03:44
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,
the sentence reads
'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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New post 11 Apr 2016, 00:37
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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New post 11 Apr 2016, 01:11
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.

[Reveal] Spoiler:
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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New post 31 May 2016, 20:37
mods pls update the question to remove answer from the text.
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New post 31 May 2016, 22:31
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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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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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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New post 06 Jun 2016, 12:30
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.
Re: In a recent poll, 71% of respondents reported that they   [#permalink] 06 Jun 2016, 12:30

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