Solution 1 :- Negation Technique.
Conclusion :- drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers whose vehicles are not equipped with radar detectors.
Negating Answer Choices A and B :-
A. Drivers who do not equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers whose vehicles are
equipped with radar detectors.{Supporting the conclusion}.
B. Drivers who are ticketed for exceeding the speed limit are not more likely to exceed the speed limit regularly than are drivers who are ticketed.{It means that vehicles of these drivers are equipped with radar detectors and they are not exceeding the speed limit compared to drivers who don't have radar detectors destroying the conclusion} Hence, correct.
Solution 2 :- Bridging Technique.
Let’s look at the question stem first. We need to find an assumption. An assumption is a missing necessary premise. Something that will not only strengthen the conclusion but also be essential to the argument.
An assumption is a statement that needs to be added to the premises for the conclusion to be true. Let’s first find the premises and the conclusion of this argument.
Premises:
– Only 3% of drivers on Maryland highways had radar detectors.
– 33% of vehicles that got speeding tickets had radar detectors.
Conclusion:
Drivers with radar detectors are more likely to exceed the speed limit regularly than other drivers.
There must be some disconnect between the premises and conclusion since there is an assumption in the argument. Look carefully. Premises give you the connection between ‘vehicles that have radar detectors’ and ‘vehicles that get speeding tickets’. The conclusion, on the other hand, concludes a relation between ‘vehicles that have radar detectors’ and ‘vehicles that exceed the speed limit’. The assumption must then give a connection between ‘vehicles that get speeding tickets’ and ‘vehicles that exceed speed limit’.
To clarify it further,
A – vehicles that have radar detectors
B – vehicles that get speeding tickets/vehicles that were ticketed for speeding
C – vehicles that exceed the speed limit
Premises:
– Only 3% of all vehicles are A
– 33% of B are A
Conclusion:
– A are more likely to be C
The assumption needs to be something that links B to C i.e. that links ‘vehicles that get speeding tickets’
to ‘vehicles that exceed the speed limit’. Option (B) gives us that relation. It says ‘B are more likely to be C’.
Lets add it to premises and see if the conclusion makes more sense now:
– Only 3% of drivers on Maryland highways had radar detectors.
– 33% of vehicles that got speeding tickets had radar detectors.
– Drivers who get speeding tickets are more likely to exceed the speed limit regularly than others.
Conclusion: Drivers with radar detectors are more likely to exceed the speed limit regularly than other drivers.
Now it makes sense!
Let’s take a quick look at the other options and see why they don’t work. We will retain the A, B, C structure given above.
Option (A) says ‘A are less likely to be B’ – Cannot be our assumption
Option (C) only tells us that number of B are greater than number of A.
Option (D) tells us that many vehicles were ticketed multiple times.
Option (E) compares drivers on Maryland highways with drivers on other state highways. This is out of scope.
Hence B.