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Burglar alarm systems can be inaccurate in two ways: they [#permalink]
 17 Feb 2009, 22:31
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Burglar alarm systems can be inaccurate in two ways: they can fail to detect an intruder when one is present, or they can falsely report the presence of an intruder. To detect the presence of an intruder most accurately, homeowners should purchase the system that is least likely to falsely report the presence of an intruder.
If true, which of the following would most strengthen the above recommendation?
A) The police respond to automatic alerts from burglar alarms more quickly than they do to telephone calls reporting the presence of an intruder.
B) The burglar alarm system that is least likely to sound its alarm when there is no intruder present is equal in price to all other major brands of alarm systems.
C) Local police forces vary in their response rates to burglar alarm systems.
D) All burglar alarm systems have the same rate of mistaking an animal for a burglar.
E) All burglar alarm systems have the same rate of failing to detect an intruder when one is present.
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Senior Manager
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E
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Manager
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A fantastic question. A real twister.
E it is.
[Alarm Defect Type 1] can fail to detect an intruder when one is present
[Alarm Defect Type 2] can falsely report the presence of an intruder
[Conclusion] homeowners should purchase the system that is least likely to falsely report the presence of an intruder. In other words , avoid [Alarm Defect Type 2].
But why [Alarm Defect Type 1] is not an consideration in the conclusion ?
E) All burglar alarm systems have the same rate of failing to detect an intruder when one is present.
In other words , [Alarm Defect Type 1] is same for all brands.
It completely makes sense just to look only avoid [Alarm Defect Type 2].
Voila !
Last edited by gmatavenue on 17 Feb 2009, 23:17, edited 1 time in total.
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Senior Manager
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Without a doubt, it's E.
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Senior Manager
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reply2spg wrote: Burglar alarm systems can be inaccurate in two ways: they can fail to detect an intruder when one is present, or they can falsely report the presence of an intruder. To detect the presence of an intruder most accurately, homeowners should purchase the system that is least likely to falsely report the presence of an intruder.
If true, which of the following would most strengthen the above recommendation?
A) The police respond to automatic alerts from burglar alarms more quickly than they do to telephone calls reporting the presence of an intruder.
B) The burglar alarm system that is least likely to sound its alarm when there is no intruder present is equal in price to all other major brands of alarm systems.
C) Local police forces vary in their response rates to burglar alarm systems.
D) All burglar alarm systems have the same rate of mistaking an animal for a burglar.
E) All burglar alarm systems have the same rate of failing to detect an intruder when one is present. i agree with the explanation given by gmatavenue.
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Current Student
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Good question. Agree with E
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E
Conclusion depends only on the false positive. Hence the error must be same across all alarms if False positive is the determining factor.
Thanks
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Manager
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My answer is "E" as well. Wonderful question.
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Director
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OA E
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E
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Re: Burglar alarm systems can be inaccurate in two ways: they [#permalink]
17 Oct 2012, 02:10
Hi, you shared nice piece of information and I also have some knowledge about the burglar alarms and security systems ,so I also want to share some tips for saving yourselves from burglars. All doors that lead to the exterior of your abode should be running a heavy-duty deadbolt which has a minimum one-inch throw.Lock your windows and secure them in order that they can’t be raised ample for a person to have in from the outside. so I would like to suggest to all my friends must install the security and burglar alarms. brisbane alarm systems
Last edited by leemike114 on 30 Oct 2012, 02:00, edited 1 time in total.
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gmatavenue wrote: A fantastic question. A real twister.
E it is.
[Alarm Defect Type 1] can fail to detect an intruder when one is present
[Alarm Defect Type 2] can falsely report the presence of an intruder
[Conclusion] homeowners should purchase the system that is least likely to falsely report the presence of an intruder. In other words , avoid [Alarm Defect Type 2].
But why [Alarm Defect Type 1] is not an consideration in the conclusion ?
E) All burglar alarm systems have the same rate of failing to detect an intruder when one is present.
In other words , [Alarm Defect Type 1] is same for all brands.
It completely makes sense just to look only avoid [Alarm Defect Type 2].
Voila ! Yes it's E and your method is faster than my method. Beautiful and simple.
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Re: Burglar alarm systems can be inaccurate in two ways: they [#permalink]
01 Apr 2013, 02:30
This is the question where the assumption and the strengthen option, both are the same.
If the question would have been that what can be assumed for the argument to be true, then also the option E would have been the correct answer.
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Re: Burglar alarm systems can be inaccurate in two ways: they
[#permalink]
01 Apr 2013, 02:30
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