For every 100 car accidents on the road, not more than 30

Dear MacFauz,
To be honest, I have a few criticisms of this question. First of all, the argument is particular short ---- you will notice that GMAT CR question prompts are typically meaty paragraphs. Few in the OG are as short as this. There are usually more factors in play.

Second, this argument treads dangerous close to territory that some people might consider offensive --- the whole "women are bad drivers" stereotype, which is contentious and which deeply offends some people. You will notice, the GMAT CR is scrupulous about avoiding topics that are likely to offend people on grounds of sexism, racism, religion, etc. etc. Whether the argument supports this stereotype or not, the fact that some people find it offensive is a very good reason to avoid it all together.

Finally, there's only really two factors under consideration --- gender and accident rate ---- and so this makes it extraordinarily easy to eliminate answer --- it's very clear that answers (A) & (B) & (C) & (E) are irrelevant. You see, if the argument mentions, say, four or five factors, then the answer can have an interesting interplay of these various factors, and it gives test taker much more to analyze.

Those are my thoughts.

Mike

Dear shanmugamgsn,

stimulus is not pointing any particular habit of men drivers. it is just saying their proportion in causing accidents is greater, whatsoever be the reasons.

Conclusion :- women are less prone to cause car accident than men are.

Evidence :- 70% of the accidents are caused by men.

Choice B :- men often use mobile phones while driving. so this may explains the cause behind greater proportion of men causing accidents than that of women. How does this choice weakens the argument? It indeed strengthens.

Choice D :- 90% of the car drivers are men which cause 70% accidents, whereas 10% of car drivers are women which causes 30% of accidents.
This clearly weakens the argument

Regards,

Abhijit.

Difficulty:

5% (low)


Question Stats:


100% (01:42) correct 0% (00:00) wrong based on 11 sessions
For every 100 car accidents on the road, not more than 30 are caused by female drivers. Hence it can be concluded that women are less prone to cause car accidents on the road than men are.

Which of the following, if true, would cast the most serious doubt on the conclusion drawn by the argument?

A) Female drivers on average own more expensive cars than male drivers do.

B) Male drivers are much more likely to have been using a mobile phone while causing the accident than are female drivers.

C) Male drivers take better care of their cars than do female drivers.

D) Out of all car drivers on the road, ninety percent are male.

E) Heavy vehicles such as trucks and buses are almost always driven by male drivers.

I believe that is D

thanks

D) Out of all car drivers on the road, ninety percent are male.

THIS IS THE CORRECT ANSWER AS LETS AKE THE EXAMPLE THAT THERE ARE 150 CARS (135 MALE AND 15 FEMALE)AND THE ACCIDENT OF 50 CARS OCCURS. SO 30 PERCENT OF 50 IS 15 THAT IS EQUAL TO TOTAL NUMBER OF WOMEN DRIVER SO CONCLUSION OF that woman is less prone to cause car accidents on the road than men are is refuted .
thank you

For every 100 car accidents on the road, not more than 30 are caused by female drivers. Hence it can be concluded that women are less prone to cause car accidents on the road than men are.

Which of the following, if true, would cast the most serious doubt on the conclusion drawn by the argument?

A) Female drivers on average own more expensive cars than male drivers do.

B) Male drivers are much more likely to have been using a mobile phone while causing the accident than are female drivers.

C) Male drivers take better care of their cars than do female drivers.

D) Out of all car drivers on the road, ninety percent are male.

E) Heavy vehicles such as trucks and buses are almost always driven by male drivers.

Hello, SwagatamGhosh. I am guessing you wanted an Expert reply to the question, so I will provide one. As I typically do, I take a look at the question before the passage so that I know how to frame what I read.


This is a straightforward weaken question, and we need to weaken the argument or conclusion. We do that by sticking to exactly what the conclusion says.


The opening line is a premise that will lead to the argument. Out of every 100 car accidents, no more than 30 are caused by female drivers.

The second line is the conclusion. Apparently, women are less prone to cause car accidents, compared to men.

In order to weaken this conclusion, we want to find an answer that allows us to reconsider whether women may not be less prone to cause car accidents based on the statistics cited. We cannot attack the statistics themselves, only the conclusion drawn from them.


The type of car driven by anyone is an irrelevant concern when the issue is to assess whether, once again, women are less prone to cause car accidents. That is, knowing the relative cost of the type of vehicle driven by women or by men does not provide any insight into the matter.


Now we are getting into why accidents may have occurred, but such a cause still does not touch on the frequency with which males or females actually cause car accidents in general. This information, then, has no bearing on the conclusion we need to weaken.


This sort of roundabout answer can get some test-takers into trouble, since the logic might go that a car that is in better shape is more likely to outperform another car, and who are the drivers taking better care of their cars? But the answer proves unsatisfactory in that we have to fill in a could-be-true scenario and make it a must-be-true condition. Just because someone takes better care of a car does not make that driver any less susceptible to causing a car accident.


This makes sense. If nine out of ten car drivers are males, then there should statistically be more car accidents caused by male drivers. All things being equal, we might expect ninety percent of car accidents to be caused by male drivers. The statistics from the first line of the passage only tell us that female drivers cause no more than thirty percent of such accidents. Although this is not firm proof that women are more prone to causing car accidents than men—for all we know, women could be causing only one percent of all car wrecks, such is the nature of not more than—we do at least have a reason to doubt the conclusion that women, based on the statistics cited, are necessarily less prone to cause car accidents. All we need to do is check (E) for another possible contender.


Another vehicle-type answer, no more pertinent than (A). All we care about, since the conclusion is what we need to weaken, is who is causing car accidents on the road, men or women, and in what proportion they are doing so. This information gives us nothing new to consider to that end.

Of the options listed, then, (D) is the best answer. Needless to say, the question and its battle-of-the-sexes focus would NOT appear on the GMAT™, but if you find yourself fishing around for questions on the forum, I see no harm in taking on such a side challenge. For GMAT™ purposes, though, stick to official questions from GMAC™.

Good luck with your studies.

- Andrew

Thank you for the thorough explanation...it really helped me to get through a statistical understanding of the question to the answer.