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06 May 2011, 01:55
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IMO A
Conclusion: Air travel is becoming increasingly more dangerous.
Evidence: In the last year there have been seven major collisions resulting in over 700 deaths, more deaths than in any previous year.
Which statement, if true, would most weaken the argument above?
(A) Since the volume of air traffic has been increasing all the time, an increase in the number of deaths due to collisions does not necessarily mean greater danger. --> Weaken the argument.
An increase of death people from air traffic last year does not mean that air travel is more dangerous. We should compare it in terms of % rather than number.
Last year: 700 deaths, the volume of air traffic 2 Million ---> 350 ppm.
Previous year: Let's assume 500 deaths, the volume of air traffic 1 Million --> 500 ppm.
As a result, percentage of air traffic death per fly in last year (350 ppm) is lower than that in previous year(500 ppm).
(B) The increase in collisions can be explained by statistical coincidence, hijackings, and unusual weather.
--> The given information described the cause of 700 deaths from air travel in last year but did not weaken the argument.
(C) Mortality per passenger mile is lower for air travel than for any kind of surface transportation.
--> Out of Scope - the argument discussed only air traffic transportation.
(D) The increase in deaths due to collision in air travel has proceeded at a rate identical to that for deaths in all other major forms of transportation.
--> Out of Scope - The argument did not compare death rate in air travel with other types of transportation.
(E) Last year the average number of passengers per flown plane was significantly lower than that of previous years.
--> Strengthen the argument
Last year: 700 deaths, the volume of air traffic 0.7 Million ---> 1,000 ppm.
Previous year: Let's assume 500 deaths, the volume of air traffic 1 Million --> 500 ppm.
As a result, percentage of air traffic death per fly in last year (1,000 ppm) is higher than that in previous year(500 ppm).
Conclusion: Air travel is becoming increasingly more dangerous.
Evidence: In the last year there have been seven major collisions resulting in over 700 deaths, more deaths than in any previous year.
Which statement, if true, would most weaken the argument above?
(A) Since the volume of air traffic has been increasing all the time, an increase in the number of deaths due to collisions does not necessarily mean greater danger. --> Weaken the argument.
An increase of death people from air traffic last year does not mean that air travel is more dangerous. We should compare it in terms of % rather than number.
Last year: 700 deaths, the volume of air traffic 2 Million ---> 350 ppm.
Previous year: Let's assume 500 deaths, the volume of air traffic 1 Million --> 500 ppm.
As a result, percentage of air traffic death per fly in last year (350 ppm) is lower than that in previous year(500 ppm).
(B) The increase in collisions can be explained by statistical coincidence, hijackings, and unusual weather.
--> The given information described the cause of 700 deaths from air travel in last year but did not weaken the argument.
(C) Mortality per passenger mile is lower for air travel than for any kind of surface transportation.
--> Out of Scope - the argument discussed only air traffic transportation.
(D) The increase in deaths due to collision in air travel has proceeded at a rate identical to that for deaths in all other major forms of transportation.
--> Out of Scope - The argument did not compare death rate in air travel with other types of transportation.
(E) Last year the average number of passengers per flown plane was significantly lower than that of previous years.
--> Strengthen the argument
Last year: 700 deaths, the volume of air traffic 0.7 Million ---> 1,000 ppm.
Previous year: Let's assume 500 deaths, the volume of air traffic 1 Million --> 500 ppm.
As a result, percentage of air traffic death per fly in last year (1,000 ppm) is higher than that in previous year(500 ppm).
