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The advanced technology of ski boots and bindings has

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The advanced technology of ski boots and bindings has [#permalink] New post 28 Aug 2012, 06:55
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The advanced technology of ski boots and bindings has brought a dramatic drop in the incidence of injuries that occur on the slopes of ski resorts: from 9 injuries per 1,000 skiers in 1950 to 3 in 1980. As a result, the remainder of ski-related injuries, which includes all injuries occurring on the premises of a ski resort but not on the slopes, rose from 10 percent of all ski-related injuries in 1950 to 25percent in 1980. The incidence of these injuries, including accidents such as falling down steps, increases with the amount of alcohol consumed per skier.

Which one of the following can be properly inferred from the passage?
(A) As the number of ski injuries that occur on the slopes decreases, the number of injuries that occur on the premises of ski resorts increases.
(B) The amount of alcohol consumed per skier increased between 1950 and 1980.
(C) The technology of ski boots and bindings affects the incidence of each type of ski-related injury.
(D) If the technology of ski boots and bindings continues to advance, the incidence of ski-related injuries will continue to decline.
(E) Injuries that occurred on the slopes of ski resorts made up a smaller percentage of ski-related injuries in 1980 than in 1950.
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Re: Ski-related injuries in 1950 [#permalink] New post 28 Aug 2012, 07:20
The number of injuries on the slopes has decreased in 1980 compared to 1950.But the total number of injuries has increased .Hence the percentage of injuries on the slope has decreased in 1980 compared to 1950.Hence answer is E.
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Re: Ski-related injuries in 1950 [#permalink] New post 28 Aug 2012, 07:49
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We’re told that, from 1950 to 1980, the percentage of all ski-related injuries at ski resorts that did not occur on the slopes increased from 10% to 25%. That must mean that the percentage of ski-related injuries at ski resorts that did occur on the slopes must have decreased over that same period. Think about it this way: there are only two possible alternatives for a ski related injury: either it occurs on the slopes or it does not occur on the slopes. So if the share of ski-related injuries represented by one type of injury goes up, the share represented by the other type MUST go down. That’s choice (E).

(A) We have no information about the number of the different types of ski-related injuries occurring, only about the percentage of total injuries represented by the two different types of injuries. Since we don’t know how or whether the total number of injuries changed, we can’t infer (A).

(B) We can infer nothing about the amount of alcohol consumed. It’s true that increased alcohol consumption causes an increase in injuries off the slopes, but we don’t know that those injuries have increased numerically, nor do we know that alcohol consumption is the only thing that could bring about an increase.

(C) Although the stimulus says improved ski boots and bindings have decreased the incidence of injuries on the slopes, it never implies that they have any effect on off-slope
injuries.

(D) is unwarranted for two reasons: first, the fact that better boots and bindings have reduced the incidence of on-slope injuries in the past is no guarantee that they will do so in the future and, second, (D) speaks of “ski-related injuries” in general, and we have no reason to believe that boots and bindings have any effect on the incidence of off-slope injuries.
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Re: The advanced technology of ski boots and bindings has [#permalink] New post 02 Sep 2012, 23:44
(A) As the number of ski injuries that occur on the slopes decreases, the number of injuries that occur on the premises of ski resorts increases. - Relation between ski injuries on slopes and premises of ski resorts is not mentioned in the argument - Incorrect
(B) The amount of alcohol consumed per skier increased between 1950 and 1980. - Cannot be inferred from the passage - Incorrect
(C) The technology of ski boots and bindings affects the incidence of each type of ski-related injury. - Out of scope - Incorrect
(D) If the technology of ski boots and bindings continues to advance, the incidence of ski-related injuries will continue to decline. - Cannot be inferred with the information given in the passage - Incorrect
(E) Injuries that occurred on the slopes of ski resorts made up a smaller percentage of ski-related injuries in 1980 than in 1950. - The injuries on the slopes has decreased from the year 1950 to 1980. That would automatically decrease the percentage share of injuries on slopes over the total number of injuries - Correct
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Re: The advanced technology of ski boots and bindings has [#permalink] New post 01 Nov 2013, 17:59
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Re: The advanced technology of ski boots and bindings has [#permalink] New post 03 Nov 2013, 04:31
I used some Mathematics to tackle this question...

1.) 9 Injuries on the slopes in 1950, 10% of all injuries were not on the slopes. So we can say that 1 injury occurred in the premises of the ski resort.

1/10- 10% of all Injuries are on the premises.

2.) 3 Injuries on the slopes in 1980, 25% of all injuries were not on the slopes. So we can say that 1 injury occurred in the premises of the ski resort.

1/4- 25% of all Injuries are on the premises.

(A) As the number of ski injuries that occur on the slopes decreases, the number of injuries that occur on the premises of ski resorts increases.---- Incorrect, as you can see above that number of ski injuries decreases from 9 to 3 but then number of injuries that occur on the premises stay the same.
(B) The amount of alcohol consumed per skier increased between 1950 and 1980.--- Out of scope. No information regarding alcohol consumption
(C) The technology of ski boots and bindings affects the incidence of each type of ski-related injury.---- Each type is taking it too far isn't it??? The technology must have affected some of the injuries but definitely not all...
(D) If the technology of ski boots and bindings continues to advance, the incidence of ski-related injuries will continue to decline.---- This is a future event. What if there cannot be any more decline in the injuries no matter what you do with ski boots and bindings...
(E) Injuries that occurred on the slopes of ski resorts made up a smaller percentage of ski-related injuries in 1980 than in 1950.--- CORRECT, as you can see in the analysis above, Injuries that occurred on the slopes in 1980-3/4=75% whereas in 1950- 9/10-90%. Absolutely TRUE.
Re: The advanced technology of ski boots and bindings has   [#permalink] 03 Nov 2013, 04:31
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