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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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foolbox wrote:
Traveler: Southern Airways has a far worse safety record that Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents. Therefore, although Air Dacentaria is slightly more expensive, I will choose it over Southern Airways for my flight from Pederton to Dacenta, since it is worth paying extra to have a safer flight.

Which of the following, if ture, casts the most serious doubt on the traveler
s argument?

A. Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.
B. Most Southern Airways flights, ut not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous.
C. For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, that the model Air Dacentaria uses for its flights on the same route.
D. Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways.
E. Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.


I picked E originally but this is why i think E is wrong...

although the proportions of accidents is small, SA may still have a greater accident rate than AD. thus his conclusion still holds, AD is safer.

B weakens it by giving an alternative explanation to why it SA is unsafe. Weakens the premise that SA is unsafe overall; stats are skewed b/c of that one airport.
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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B for me too. Reasons given :
A. Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.
Quote:
(Stops the flight makes are not relevant )

B. Most Southern Airways flights, ut not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous.
Quote:
(This gives an alternate reason for the safety of the flight in the route in Qn. Keep it.)

C. For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, that the model Air Dacentaria uses for its flights on the same route.
Quote:
(Models of airplane not relevant)

D. Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways.
Quote:
(cost is not relevant. Safety is.)

E. Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.
Quote:
(proportion of flights having accidents in misleading here, since we know the accidents are more for SA.Also, this is not giving any specific info about the particular route. Thus eliminate.)

Thus B.
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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B says due to airport location, more accidents occurs. So what? accidents still occur whether it is due to clouds or pilots or whether or other reason.

E says the proportion is same, means the % of accidents are same. What does that mean? Higher no.of flights do not encounter accidents which can assure that it is safer.
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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ravikrishna1979 wrote:
B says due to airport location, more accidents occurs. So what? accidents still occur whether it is due to clouds or pilots or whether or other reason.

E says the proportion is same, means the % of accidents are same. What does that mean? Higher no.of flights do not encounter accidents which can assure that it is safer.


No, B is saying that the majority Southern Airway's accidents happen at a different airport than the one the person is flying out of. Meaning the flight that he/she is taking is actually safe, so there is no reason to spend the extra money to fly on the aggregately safer airline.

For E, proportions of safe flights to crashes are inherently low for airlines but even small differences in crash rates can have huge impacts on the number of crashes.
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
Why is E not the answer

It also weakens the support for conclusion by saying the rates of accident for both are same
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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GDT wrote:
Why is E not the answer

It also weakens the support for conclusion by saying the rates of accident for both are same

Watch those assumptions, GDT. Look at choice (E) again:

Quote:
E. Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.


Very small is not synonymous with the same, nor can you qualify exactly what very small means, in terms of numbers. 1 percent? 5 percent? Can we say that each airline has the same proportion of flights that have accidents? No. You should also know from studying Quant that a proportion and a number of something are not necessarily the same. The conclusion could very well hold true, given this new information. In choice (B), if only Southern Airways uses this most dangerous airport, but not on the very flight the traveler is taking, from Pederton to Dacenta, then there seems to be no compelling reason within the information provided for the person to assume that flying Air Dacentaria will be any safer. That is what we are after here, the best, most reasonable answer of the five given. Choice (E) simply requires too much speculation to work.

I hope that clarifies your doubts. If you have further questions, I would be happy to help out.

- Andrew
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
@KarishmaB
Maam, one fundamental doubt - in these kind of questions, what should we weaken?
Should we say that in general the Southern Airways is better than the other airlines or in this specific route, the airline is better?

What exactly should be the weaken statement?
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Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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kashking wrote:
one fundamental doubt - in these kind of questions, what should we weaken?
Should we say that in general the Southern Airways is better than the other airlines or in this specific route, the airline is better?

What exactly should be the weaken statement?

What we need to weaken is the support for the author's conclusion.

The support the author provides for that conclusion is this general statement:

Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents.

At the same time, the conclusion is not a general statement. It's the following specific statement:

I will choose it (Air Dacentaria) over Southern Airways for my flight from Pederton to Dacenta.

So, we need to weaken the support for the choice of Air Dacentaria over Southern Airways for the flight from Pederton to Dacenta.
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Re: Traveler: Southern Airways has a far worse safety record than Air Dace [#permalink]
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foolbox wrote:
Traveler: Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents. Therefore, although Air Dacentaria is slightly more expensive, I will choose it over Southern Airways for my flight from Pederton to Dacenta, since it is worth paying extra to have a safer flight.

Which of the following, if true, casts the most serious doubt on the traveler's argument?

A. Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.

B. Most Southern Airways flights, but not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous.

C. For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, than the model Air Dacentaria uses for its flights on the same route.

D. Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways.

E. Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.

­

Premises:
Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents.
Air Dacentaria is slightly more expensive.
It is worth paying extra to have a safer flight.

Conclusion:
I will choose Air Dacentaria over Southern Airways for my flight from Pederton to Dacenta.


The premises talk about Southern Airways’ worse safety record and the conclusion concludes about a particular flight (from Pederton to Dacenta). We need to weaken the conclusion.

A. Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.

Irrelevant to our argument. We don’t know how non-stop vs one stop impacts the decision of the traveller. 
  

B. Most Southern Airways flights, but not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous.

It tells us that the bad statistics of Southern Airways is because it extensively uses the Sarmouth airport - a very dangerous airport. But for its flight from Pederton to Dacenta, it doesn’t use that airport. Hence it casts doubt on the traveller’s decision of not using Southern Airways for his flight due to its bad safety record. The safety record of the airline would not be the same as the safety record for the flight which he wants to take. 

Correct. 


C. For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, than the model Air Dacentaria uses for its flights on the same route.



Irrelevant to our argument. We don’t know how a smaller vs bigger plane impacts the decision of the traveller.


D. Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways.


Irrelevant to our argument. We know that Air Dacentaria has a more expensive flight. Despite that, the traveller wants to take it. When did it become more expensive, doesn’t matter.


E. Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.

Irrelevant to our argument. We are talking about relative figures. Relative to Air Dacentaria, Southern Airways has worse figures. That is why the traveller prefers one over the other. Whether in absolute terms the figures are bad or not is irrelevant.

Answer (B)

Discuss on Weaken Questions: https://youtu.be/EhZ8FKkfy0k
 
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