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In 1987, an environmental action group reported a 65-percent

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In 1987, an environmental action group reported a 65-percent [#permalink] New post 04 Jul 2014, 20:04
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In 1987, an environmental action group reported a 65-percent response rate to a questionnaire sent to all of its members. The subject of the questionnaire was ocean dumping. On the basis of these results, the group expects a 65-to-70 percent response rate to its upcoming questionnaire on air pollution.

The environmental group's expectation is based on which of the following assumptions?

A The group's membership has not declined by more than 5 percent since 1987.
B The same number of surveys will be distributed as were distributed in 1987.
C People who are concerned about ocean dumping are even more concerned about air pollution.
D The response rate of one questionnaire can be predicted from that of another.
E The total amount of pollution today is the same as it was in 1987.


please explain why C is wrong.
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In 1987, an environmental action group reported a 65-percent [#permalink] New post 04 Jul 2014, 23:37
Premise 1 : In 1987, an environmental action group reported a 65-percent response rate to a questionnaire sent to all of its members.
Premsie 2 : The subject of the questionnaire was ocean dumping.
Conclusion : the group expects a 65-to-70 percent response rate to its upcoming questionnaire on air pollution.

Author is assuming that because in last questionnaire they got 65% response so even this time also they will get 65% to 70% response.

A The group's membership has not declined by more than 5 percent since 1987. -> Even if group's membership is declined total percentage would be 100%, so OUT.

B The same number of surveys will be distributed as were distributed in 1987. -> For finding percentage response we require total. Same number of response does not matter.

C People who are concerned about ocean dumping are even more concerned about air pollution. -> Author's prediction is based on last survey/questionnaire. This could be correct be correct but author's prediction is not based on this assumption

D The response rate of one questionnaire can be predicted from that of another. -> CORRECT
Negation: The response rate of questionnaire CAN NOT be predicted from that of another.
This statement weakens the conclusion and states that from last response you can't predict the response of new survey.
Also this statement is defender which removes the other possibilities.


E The total amount of pollution today is the same as it was in 1987. -> Comparison is not stated so this option is out of scope.

Example :
Shopkeeper : Last year we sold 100 Kg Banana Chips so this year we would sell almost 150 Kg Potato Chips.

Here Shopkeeper does not assume that people like Potato Chips more than Banana Chips. His assumption is based on last year's sell.

Hope above explanation will be useful.
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Re: In 1987, an environmental action group reported a 65-percent [#permalink] New post 05 Jul 2014, 01:17
anceer wrote:
In 1987, an environmental action group reported a 65-percent response rate to a questionnaire sent to all of its members. The subject of the questionnaire was ocean dumping. On the basis of these results, the group expects a 65-to-70 percent response rate to its upcoming questionnaire on air pollution.

The environmental group's expectation is based on which of the following assumptions?

A The group's membership has not declined by more than 5 percent since 1987.
B The same number of surveys will be distributed as were distributed in 1987.
C People who are concerned about ocean dumping are even more concerned about air pollution.
D The response rate of one questionnaire can be predicted from that of another.
E The total amount of pollution today is the same as it was in 1987.


please explain why C is wrong.

I chose C. but C cannot be correct because even if people are not concerned about air pollution but still they might participate in the survey.
not being concern is not equal to not participating in the survey.

but the argument in fact predicted the response rate of new survey base on response rate of a previous survey.
the basis of the argument is that what happened in the past will happened in the future.
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Re: In 1987, an environmental action group reported a 65-percent [#permalink] New post 05 Jul 2014, 01:42
bb61 wrote:
anceer wrote:
In 1987, an environmental action group reported a 65-percent response rate to a questionnaire sent to all of its members. The subject of the questionnaire was ocean dumping. On the basis of these results, the group expects a 65-to-70 percent response rate to its upcoming questionnaire on air pollution.

The environmental group's expectation is based on which of the following assumptions?

A The group's membership has not declined by more than 5 percent since 1987.
B The same number of surveys will be distributed as were distributed in 1987.
C People who are concerned about ocean dumping are even more concerned about air pollution.
D The response rate of one questionnaire can be predicted from that of another.
E The total amount of pollution today is the same as it was in 1987.


please explain why C is wrong.

I chose C. but C cannot be correct because even if people are not concerned about air pollution but still they might participate in the survey.
not being concern is not equal to not participating in the survey.

but the argument in fact predicted the response rate of new survey base on response rate of a previous survey.
the basis of the argument is that what happened in the past will happened in the future.


In an assumption question the best answer will strengthen the conclusion of the argument. Since the conclusion of the argument is about the 65-70% expected response rate predicted for the upcoming questionairre on air pollution, Option C, which talks about the concern about pollution and not about the response, can be ruled out.
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Re: In 1987, an environmental action group reported a 65-percent [#permalink] New post 05 Jul 2014, 03:04
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Re: In 1987, an environmental action group reported a 65-percent [#permalink] New post 07 Jul 2014, 01:24
Quote:
In 1987, an environmental action group reported a 65-percent response rate to a questionnaire sent to all of its members. The subject of the questionnaire was ocean dumping. On the basis of these results, the group expects a 65-to-70 percent response rate to its upcoming questionnaire on air pollution.


We are only concerned with the %age of the responses. The amount of pollution, the number of people or their beliefs should be irrelevant here.
D is the only choice dealing with that.
Re: In 1987, an environmental action group reported a 65-percent   [#permalink] 07 Jul 2014, 01:24
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