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A recent survey of all auto accident victims in Dole County

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A recent survey of all auto accident victims in Dole County [#permalink] New post 15 Aug 2003, 06:13
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1. A recent survey of all auto accident victims in Dole County found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.

The conclusion above is not properly drawn unless which of the following is true?

The answer: Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.

Why is it an assumption in order for the conclusion to be valid?

2. Which of the following best completes the passage below?

Sales campaigns aimed at the faltering personal computer market have strongly emphasized ease of use, called user-friendliness. This emphasis is oddly premature and irrelevant in the eyes of most potential buyers, who are trying to address the logically prior issue of whether----

C. currently available models are user-friendly enough to suit them
E. they have enough sensible uses for a personal computer to justify the expense of buying one

The answer is E. Why is E better than C?

Thank you :)
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 [#permalink] New post 15 Aug 2003, 08:12
the first) you have three groups of people, not two

(1) all the drivers and front-seat passengers in the survey (X)
(2) the severely injured drivers and front-seat passengers (Y)
(3) the severely injured not wearing belts (Z=0.8Y)

Z can be a tiny share of X. So wearing belts just slightly affect your chances. You have to prove that Z is significant share of X. I think this is a rationale. But the question is difficult.
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 [#permalink] New post 15 Aug 2003, 18:40
Joviest, pls give us all options w/o answers in the next question on the forum. It makes it more interesting for us to solve!
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Re: Two CR Questions [#permalink] New post 15 Aug 2003, 20:55
Joviest wrote:
1. A recent survey of all auto accident victims in Dole County found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.

The conclusion above is not properly drawn unless which of the following is true?

The answer: Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.

Why is it an assumption in order for the conclusion to be valid?



Let's assume that only 20% of people where seat belts. Since seat belts do not CAUSE accidents, we can assume that people that get into accident will has the same ratio of seat belt wearers to non seat belt wearers. Hence, it WOULD BE EXPECTED that 80% of the accidents would involve those not wearing seat belts. However, if much more that 20% wear seat belts, then if the number of people in accidents who do not have belts on is 80%, that would be disproportionate to the general pool of people, hence strengtheni9ng the conclusion.

As a corollary, suppose only 1% of the population wore seat beats. Then the 20% of those found wearing seat belts in an accident would be disproportionately LARGE and one could reasonably conclude that WEARING SEAT BELTS actually causes the injuries!!!

Hence, the simple fact that 80% of accident victims did not wear seat belts is not enough by itself to conclude that seat belts work, however, whether or not this proportion is disproportionate to the general population is.

A is the only one that seems to show this disproportionality.
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Last edited by AkamaiBrah on 19 Aug 2003, 00:26, edited 1 time in total.
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 [#permalink] New post 17 Aug 2003, 04:05
I repost those two questions as follows:

1. A recent survey of all auto accident victims in Dole County found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.

The conclusion above is not properly drawn unless which of the following is true?

(A) Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.
(B) Considerably more than 20 percent of drivers and front-seat passengers in Dole County always wear seat belts when traveling by car.
(C) More drivers and front-seat passengers in the survey than rear-seat passengers were very severely injured.
(D) More than half of the drivers and front-seat passengers in the survey were not wearing seat belts at the time of their accidents.
(E) Most of the auto accidents reported to police in Dole County do not involve any serious injury.

The Answer: A

2. Which of the following best completes the passage below?

Sales campaigns aimed at the faltering personal computer market have strongly emphasized ease of use, called user-friendliness. This emphasis is oddly premature and irrelevant in the eyes of most potential buyers, who are trying to address the logically prior issue of whether----

(A) user-friendliness also implies that owners can service their own computers
(B) personal computers cost more the more user-friendly they are
(C) currently available models are user-friendly enough to suit them
(D) the people promoting personal computers use them in their own homes
(E) they have enough sensible uses for a personal computer to justify the expense of buying one

The Answer: E

Thanks :)
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 [#permalink] New post 17 Aug 2003, 05:47
Sales campaigns aimed at the faltering personal computer market have strongly emphasized ease of use, called user-friendliness. This emphasis is oddly premature and irrelevant in the eyes of most potential buyers, who are trying to address the logically prior issue of whether----


E is better than C because the first issue that comes to mind while making a purchase is to try & estimate the uses of the product and if it is really going to be used. For example, if I were to buy a music system, I would first decide if I really would use it, as only then will I want to buy it. Add ons like surround speakers etc would be deciding factors only if Im convinced I have a use for the product.
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 [#permalink] New post 19 Aug 2003, 00:30
Joviest wrote:
I repost those two questions as follows:

2. Which of the following best completes the passage below?

Sales campaigns aimed at the faltering personal computer market have strongly emphasized ease of use, called user-friendliness. This emphasis is oddly premature and irrelevant in the eyes of most potential buyers, who are trying to address the logically prior issue of whether----

(A) user-friendliness also implies that owners can service their own computers
(B) personal computers cost more the more user-friendly they are
(C) currently available models are user-friendly enough to suit them
(D) the people promoting personal computers use them in their own homes
(E) they have enough sensible uses for a personal computer to justify the expense of buying one

The Answer: E

Thanks :)


The wording of the question implies that there is a possibility that the whole idea of "user-friendliness" is "premature" hence irrelevant. If a user has not yet determined whether there are any "uses" for a computer, the question of whether or not it is "user-friendly" is moot. Hence, E is the answer.
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MBA, Anderson School of Management, UCLA, Class of 1993

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Re: Two CR Questions [#permalink] New post 11 Jun 2010, 07:14
its A
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Re: Two CR Questions [#permalink] New post 13 Jul 2010, 21:54
takers any?
Re: Two CR Questions   [#permalink] 13 Jul 2010, 21:54
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