Radio Stations with radio data system (RDS) technolodgy : GMAT Critical Reasoning (CR)
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16 Jun 2008, 03:18
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Radio Stations with radio data system (RDS) technolodgy broadcast special program information that only radios with an RDS feature can receive. Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600. However, since the number of RDS equipped radios in Verdland was about the same in 1996 as in 1994, the number of verdlanders receiving the special program information probably did not increase significantly.

Which of the following is an assumption on which the argument depends?

(A) Few if any of the RDS radio stations that began broadcasting in Verdland after 1994 broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.
(C) Equipping a radio station with RDS technology does not decrease the station's listening area.
(D) In 1996 Verdlanders who did not own radios equipped to receive RDS could not any programming from the RDS radio stations that began broadcasting in Verdland after 1994.
(E) The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.
[Reveal] Spoiler: OA
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16 Jun 2008, 04:22
A

OA ?
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16 Jun 2008, 05:27
lexis wrote:
Radio Stations with radio data system (RDS) technolodgy broadcast special program information that only radios with an RDS feature can receive. Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600. However, since the number of RDS equipped radios in Verdland was about the same in 1996 as in 1994, the number of verdlanders receiving the special program information probably did not increase significantly.

Which of the following is an assumption on which the argument depends ?

A) Few if any of the RDS radio stations that began broadcasting in Verdland after 1994 broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.

C) Equipping a radio station with RDS technology does not decrease the station's listening area.

D) In 1996 Verdlanders who did not own radios equipped to receive RDS could not any programming from the RDS radio stations that began broadcasting in Verdland after 1994.

E) The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.

I will go with A.
In this passage, no of radio stations increased but the listener remain constant.
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16 Jun 2008, 07:01
nice CR. A for me. But I have a technical background so that I can't accept CDE and can't see why B could be relevant...
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16 Jun 2008, 07:08
good question
took some 3 mins on this

and what is the OA and OE for this
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16 Jun 2008, 20:24
I bet A.
If OA is something else , I will be breaking my head
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16 Jun 2008, 20:35
GMATPrep. I won't steal Lexis's thunder by giving out the OA...
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16 Jun 2008, 21:41
Golden rule of assumption question - apply negation and the option should go against the conclusion.

Try B : In 1996 Verdlanders who lived within the listening area of an RDS station did not had a radio equipped to receive RDS.

It means there were some people, with RDS radio set, living in areas with no RDS listening area. when the radio station increased from X to Y, there are high chances thst these people would have come in listening areas and number of people listening to RDS would have increased. But as per question it dint happen.

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16 Jun 2008, 22:45
me for A too
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16 Jun 2008, 23:05
I will go for A.
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16 Jun 2008, 23:10
All the people who are voting for A. Could someone please explain the reasoning.
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21 Jun 2008, 09:41
OA is A
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12 Jul 2010, 06:13
Nice CR question.
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12 Jul 2010, 17:47
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At first I picked E, but now I understand why A is correct.

Based on the question we know RDS-reception requires 3 things:
1) Station must send RDS info with signal
2) Receiving radio must be able to decode RDS information

Also we know:
the number of stations grew from 250 to 600
the number of receivers stayed the same

The conclusion is "..the number of verdlanders receiving the special program information probably did not increase significantly. "

In this problem we must support this conclusion (in my opinion a poor one) with a key assumption.

Choice A is basically saying the additional RDS stations are in the same broadcast area as the previous RDS stations.

I have a diagram to illustrate a situation without assumption A.

Attachment:

Verdland.JPG [ 19.28 KiB | Viewed 12247 times ]

As you can see in the drawing, an additional station in a different area of Verdland could increase the number of people receiving the RDS information.

For anyone wondering why the broadcast area for the blue station is not a circle, the broadcast tower is in a deep valley.
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12 Jul 2010, 17:57
TallJTinChina wrote:
At first I picked E, but now I understand why A is correct.

Based on the question we know RDS-reception requires 3 things:
1) Station must send RDS info with signal
2) Receiving radio must be able to decode RDS information

Also we know:
the number of stations grew from 250 to 600
the number of receivers stayed the same

The conclusion is "..the number of verdlanders receiving the special program information probably did not increase significantly. "

In this problem we must support this conclusion (in my opinion a poor one) with a key assumption.

Choice A is basically saying the additional RDS stations are in the same broadcast area as the previous RDS stations.

I have a diagram to illustrate a situation without assumption A.

Attachment:
Verdland.JPG

As you can see in the drawing, an additional station in a different area of Verdland could increase the number of people receiving the RDS information.

For anyone wondering why the broadcast area for the blue station is not a circle, the broadcast tower is in a deep valley.
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12 Jul 2010, 18:00
why not C?
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12 Jul 2010, 19:39
jparraos wrote:
why not C?

My guess is the official guide would call C outside the argument.

C is an assumption that is not key to the argument. If we assume the opposite:

Equipping a radio station with RDS technology does decrease the station's listening area.

The conclusion still stands "..the number of verdlanders receiving the special program information probably did not increase significantly."

In fact if the opposite of C was true, this would give support to the conclusion "....number of verdlanders did not increase significantly." (If adding RDS capability decreased listening area then the number of verdlanders who have access to RDS could actually decrease.)

When the conclusion is stated "did not" you end up with A or B outcome.

In this case we have:
A: the number receiving RDS did not increase significantly
or
B: the number receiving RDS did increase significantly

A would include:
*a significant decrease
*a minor increase
*a constant level
*a minor decrease

As I stated in my other post this is a very weak conclusion. Using "...probably not increase significantly" reminds me of a politician.

Such as: "Good news, the growth in the unemployment rate was not as large as expected."
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12 Jul 2010, 23:31
I will go with A
Assumption or missing link should jump out immediately while reading the stem.
The question or point here is -Is there any other way through which the number of listeners could have increased?
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13 Jul 2010, 01:41
Tough one. Now with A. I missed out the key word significantly while reading
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13 Jul 2010, 22:49
I chose B, am still battling to understand why not B.
As explained in an earlier post if B is not true, then the conclusion in the passage falls apart. Reason enough to select B!
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Re: CR: RDS   [#permalink] 13 Jul 2010, 22:49

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