Find all School-related info fast with the new School-Specific MBA Forum

It is currently 16 Sep 2014, 18:16

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In 1986, the city of Los Diablos had 20 days on which air

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 09 Jun 2011
Posts: 106
Followers: 0

Kudos [?]: 14 [0], given: 0

In 1986, the city of Los Diablos had 20 days on which air [#permalink] New post 02 Sep 2011, 08:05
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

16% (02:19) correct 84% (01:52) wrong based on 41 sessions
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?

(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
Intern
Intern
User avatar
Joined: 20 Jul 2011
Posts: 11
Location: India
GPA: 3.12
WE: Information Technology (Consulting)
Followers: 0

Kudos [?]: 5 [0], given: 1

Re: GMAT_LSAT_CR [#permalink] New post 02 Sep 2011, 08:22
Looks B to me :)

The reason is that option B says the Spectometer is invented !
It doesnt say that it is used!

Whats the OA ??
_________________

Maverick%^%^

Intern
Intern
avatar
Joined: 18 Mar 2011
Posts: 9
Location: Houston TX
Schools: Boston College , U of Miami
Followers: 0

Kudos [?]: 1 [0], given: 0

Re: GMAT_LSAT_CR [#permalink] New post 02 Sep 2011, 09:52
I vote D, and my reasoning is that you have ozone levels consistently increasing each year, then dropping off the last year. So you got a crooked Mayor who is taking bribes, etc so he wont include the big polluters in their ozone studies. That alone should keep the ozone measures down in the city since you arent counting them, yet the levels still increase for 2 yrs in a row. ( hmm, that's odd) ,, so then the mayor gets busted in 1988 and the very next year, you would think ok, now these big polluters can't buy their way out of this mess and they will be included in the study, so therefore , the city will show huge increases in ozone levels bc you are now counting all these big polluters for the first time. well, in 1989 the ozone levels drop ( hmm, that's odd too). so that is why this answer choice '' least'' explains anything to me.
Intern
Intern
avatar
Joined: 11 Apr 2011
Posts: 31
Followers: 0

Kudos [?]: 0 [0], given: 9

Re: CR-City of Los Diablos [#permalink] New post 03 Sep 2011, 08:21
+1 for D
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2047
Followers: 128

Kudos [?]: 920 [0], given: 376

GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 03 Sep 2011, 10:06
bholakc wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

1986: 20 alarms
1987: Law enacted; 31 alarms
1988: 39 alarms
1989: 16 alarms


Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?

Q: What would be least helpful to determine alarm increase between 1986-1989. One would think:
--why even after the law enactment, there was an increase in the number of alarm between 1986-1988 and then sudden fall in 1989.


(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
Good reason. Because the law was not put into effect until almost 1989, the polluters had had the luxury to exploit the atmosphere to a greater degree until then.

(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
A less accurate spectrometer could be the reason for generating unwarranted alarms. The new more accurate spectrometer might have generated fewer alarms in 1989. We need to make subtle assumptions in each of these crossed items.

(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
The assumption is that the scale was made more lenient than stricter.
e.g. between 1986-1988, the alarm would raise if the pollution is more than 1mg/ft^3
e.g. in 1989, the alarm would raise if the pollution is more than 2mg/ft^3

(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.

Firstly, this statement creates a paradox why, despite these exemptions, the number of alarms went down in 1989. After all, these industries would have gotten the exemption only to freely pollute the air, right? However, we can ignore that aspect because question is focused on the increased alarm before 1989; alright.
Secondly, and this answers our question, it leaves the question in hand untouched: when the exemptions were given to these industries only in 1988, they must had been following the law until 1988. So, what on earth actually caused those increased alarms.
No clue!!!
Correct.


(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
Well!! This doesn't clearly explain the increase between 1987 and 1988, while it does explain a decrease in 1989. We can assume that breaking down process is not gradual but sporadic.



Ans: "D"
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2011
Posts: 263
Followers: 4

Kudos [?]: 22 [0], given: 9

GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 03 Sep 2011, 12:53
fluke wrote:
bholakc wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

1986: 20 alarms
1987: Law enacted; 31 alarms
1988: 39 alarms
1989: 16 alarms


Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?

Q: What would be least helpful to determine alarm increase between 1986-1989. One would think:
--why even after the law enactment, there was an increase in the number of alarm between 1986-1988 and then sudden fall in 1989.


(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
Good reason. Because the law was not put into effect until almost 1989, the polluters had had the luxury to exploit the atmosphere to a greater degree until then.

(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
A less accurate spectrometer could be the reason for generating unwarranted alarms. The new more accurate spectrometer might have generated fewer alarms in 1989. We need to make subtle assumptions in each of these crossed items.

(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
The assumption is that the scale was made more lenient than stricter.
e.g. between 1986-1988, the alarm would raise if the pollution is more than 1mg/ft^3
e.g. in 1989, the alarm would raise if the pollution is more than 2mg/ft^3

(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.

Firstly, this statement creates a paradox why, despite these exemptions, the number of alarms went down in 1989. After all, these industries would have gotten the exemption only to freely pollute the air, right? However, we can ignore that aspect because question is focused on the increased alarm before 1989; alright.
Secondly, and this answers our question, it leaves the question in hand untouched: when the exemptions were given to these industries only in 1988, they must had been following the law until 1988. So, what on earth actually caused those increased alarms.
No clue!!!
Correct.


(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
Well!! This doesn't clearly explain the increase between 1987 and 1988, while it does explain a decrease in 1989. We can assume that breaking down process is not gradual but sporadic.



Ans: "D"


D
Manager
Manager
User avatar
Joined: 20 Jul 2011
Posts: 152
GMAT Date: 10-21-2011
Followers: 0

Kudos [?]: 33 [0], given: 15

GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 05 Oct 2011, 01:25
went for B until I read this explanation. Thanks, fluke!

fluke wrote:
bholakc wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

1986: 20 alarms
1987: Law enacted; 31 alarms
1988: 39 alarms
1989: 16 alarms


Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?

Q: What would be least helpful to determine alarm increase between 1986-1989. One would think:
--why even after the law enactment, there was an increase in the number of alarm between 1986-1988 and then sudden fall in 1989.


(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
Good reason. Because the law was not put into effect until almost 1989, the polluters had had the luxury to exploit the atmosphere to a greater degree until then.

(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
A less accurate spectrometer could be the reason for generating unwarranted alarms. The new more accurate spectrometer might have generated fewer alarms in 1989. We need to make subtle assumptions in each of these crossed items.

(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
The assumption is that the scale was made more lenient than stricter.
e.g. between 1986-1988, the alarm would raise if the pollution is more than 1mg/ft^3
e.g. in 1989, the alarm would raise if the pollution is more than 2mg/ft^3

(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.

Firstly, this statement creates a paradox why, despite these exemptions, the number of alarms went down in 1989. After all, these industries would have gotten the exemption only to freely pollute the air, right? However, we can ignore that aspect because question is focused on the increased alarm before 1989; alright.
Secondly, and this answers our question, it leaves the question in hand untouched: when the exemptions were given to these industries only in 1988, they must had been following the law until 1988. So, what on earth actually caused those increased alarms.
No clue!!!
Correct.


(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
Well!! This doesn't clearly explain the increase between 1987 and 1988, while it does explain a decrease in 1989. We can assume that breaking down process is not gradual but sporadic.



Ans: "D"

_________________

"The best day of your life is the one on which you decide your life is your own. No apologies or excuses. No one to lean on, rely on, or blame. The gift is yours - it is an amazing journey - and you alone are responsible for the quality of it. This is the day your life really begins." - Bob Moawab

Manager
Manager
avatar
Status: Essaying
Joined: 27 May 2010
Posts: 156
Location: Ghana
Concentration: Finance, Finance
Schools: Cambridge
GMAT 1: 690 Q47 V37
GPA: 3.9
WE: Accounting (Education)
Followers: 1

Kudos [?]: 7 [0], given: 8

GMAT ToolKit User GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 05 Oct 2011, 06:33
D...
Manager
Manager
avatar
Joined: 28 Sep 2011
Posts: 89
Followers: 0

Kudos [?]: 14 [0], given: 15

Re: CR-City of Los Diablos [#permalink] New post 07 Oct 2011, 01:56
fluke wrote:
bholakc wrote:

(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.

Firstly, this statement creates a paradox why, despite these exemptions, the number of alarms went down in 1989. After all, these industries would have gotten the exemption only to freely pollute the air, right? However, we can ignore that aspect because question is focused on the increased alarm before 1989; alright.
Secondly, and this answers our question, it leaves the question in hand untouched: when the exemptions were given to these industries only in 1988, they must had been following the law until 1988. So, what on earth actually caused those increased alarms.
No clue!!!
Correct.


Ans: "D"


Fluke,

The question specifically looks for an explanation for the pollution levels between the period 1986 to 1989. Therefore we have to explain the pollution in 1987 and 1988. 1988 saw a peak in the pollution, can this not be explained by the malfeasance of the mayor in 1988?

I agree that this does not explain the drop in 1989. But should we be trying to explain that in the first place? The question does not seem to ask for that.
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2047
Followers: 128

Kudos [?]: 920 [0], given: 376

GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 07 Oct 2011, 02:55
DexDee wrote:
Fluke,

The question specifically looks for an explanation for the pollution levels between the period 1986 to 1989. Therefore we have to explain the pollution in 1987 and 1988. 1988 saw a peak in the pollution, can this not be explained by the malfeasance of the mayor in 1988?

I agree that this does not explain the drop in 1989. But should we be trying to explain that in the first place? The question does not seem to ask for that.


"D" just explains why alarms went up from 31 in 1987 to 39 in 1988. But, the explanation won't be considered justified because again the alarm dropped to 16 in 1989. Also, it doesn't explain why the alarm went up to 31 in 1987 from 20 in 1986, when ideally it should have gone down. You see "D" gives us a perfect reason for the increase between 1987 and 1988, but that explanation will be considered inconsistent with the alarm statistics for other years.

"But should we be trying to explain that in the first place?"
would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
I believe the question wants us to consider everything between 1986 and 1989.
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
avatar
Joined: 06 Aug 2010
Posts: 4
Followers: 0

Kudos [?]: 0 [0], given: 17

Re: CR-City of Los Diablos [#permalink] New post 10 Oct 2011, 01:57
I go for B.
Manager
Manager
avatar
Joined: 12 Jul 2011
Posts: 154
Concentration: Operations, Strategy
GMAT 1: 680 Q46 V37
WE: Engineering (Telecommunications)
Followers: 0

Kudos [?]: 13 [0], given: 42

GMAT Tests User
Re: CR-City of Los Diablos [#permalink] New post 18 Oct 2011, 04:04
D for me !!
Re: CR-City of Los Diablos   [#permalink] 18 Oct 2011, 04:04
    Similar topics Author Replies Last post
Similar
Topics:
In 1986, the city of Los Diablos had 20 days on which air lordw 6 15 Jul 2008, 10:52
In 1986, the city of Los Diablos had 20 days on which air suntaurian 2 22 Feb 2008, 18:17
In 1986, the city of Los Diablos had 20 days on which air bewakoof 10 26 Dec 2005, 22:09
In 1986, the city of Los Diablos had 20 days on which air mbamantra 13 26 Apr 2005, 07:31
In 1986, the city of Los Diablos had 20 days on which air doggita 14 24 Oct 2004, 16:16
Display posts from previous: Sort by

In 1986, the city of Los Diablos had 20 days on which air

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.