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Critical reasoning OG 13

This topic has 1 expert reply and 3 member replies
anksm22 Master | Next Rank: 500 Posts Default Avatar
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Critical reasoning OG 13

Post Wed Jul 16, 2014 8:36 am
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with
runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than
wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is
clearly borne out by the fact that the number of children injured while sledding was much higher last
winter than it was 10 years ago.

Which of the following, if true in Verland, most
seriously undermines the force of the evidence cited?


(A) A few children still use traditional wooden sleds.
(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.



Please explain this

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Post Sun Jul 27, 2014 8:52 am
You should always question an argument that turns a quantitative metric such as "greater number of injuries" into a qualitative metric such as "less safe."

We're given that a greater NUMBER of children have been injured while sledding than were 10 years ago. Does that have to mean that their sleds are less safe? We should ask:
- Are there more children sledding now than there were 10 years ago?
- Are children sledding more often?
- Is the severity of accidents the same? Safety isn't just defined by number of accidents, but how severe they are.
- Is the difference in sleds the cause of the change, or is there some other behavioral difference in children over 10 years?

If we want to WEAKEN the argument, we need a reason to suggest that number of accidents does not correlate to safety.

(A) A few children still use traditional wooden sleds.
This would strengthen the argument - it's more likely that the injuries were due to the plastic sleds.

(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
Again, this would strengthen - differences in injuries is more likely to be due to the sleds, not protective gear.

(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
Correct! This indicates that children are likely to sled more often. More sledding = more time spent / opportunity for injuries, without implying that the sled is to blame.

(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
This would be true of wooden and plastic sleds, so it wouldn't help us compare.

(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
Since the metric we're given is "number of children injured," this wouldn't make a difference. If the sled injures one person or multiple people at a time, it could still be judged unsafe.

The answer is C.

_________________


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EdM in Mind, Brain, and Education
Harvard Graduate School of Education


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VivianKerr GMAT Instructor
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Post Mon Jul 21, 2014 11:59 pm
You're welcome! Notice the key to this Weaken question is the key to MOST GMAT CR: identify the question stem and the expectations that go along with it, take notes on your yellow scratch pad, then make a Prediction for what you think the correct answer should be!

Most people miss CR when they cut corners on strategy. Smile I know I do!

_________________
Vivian Kerr
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http://www.GMATrockstar.com
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Former Kaplan and Grockit instructor, freelance GMAT content creator, now offering affordable, effective, Skype-tutoring for the GMAT at $150/hr. Contact: GMATrockstar@gmail.com

Thank you for all the "thanks" and "follows"! Smile

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Post Sun Jul 27, 2014 8:52 am
You should always question an argument that turns a quantitative metric such as "greater number of injuries" into a qualitative metric such as "less safe."

We're given that a greater NUMBER of children have been injured while sledding than were 10 years ago. Does that have to mean that their sleds are less safe? We should ask:
- Are there more children sledding now than there were 10 years ago?
- Are children sledding more often?
- Is the severity of accidents the same? Safety isn't just defined by number of accidents, but how severe they are.
- Is the difference in sleds the cause of the change, or is there some other behavioral difference in children over 10 years?

If we want to WEAKEN the argument, we need a reason to suggest that number of accidents does not correlate to safety.

(A) A few children still use traditional wooden sleds.
This would strengthen the argument - it's more likely that the injuries were due to the plastic sleds.

(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
Again, this would strengthen - differences in injuries is more likely to be due to the sleds, not protective gear.

(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
Correct! This indicates that children are likely to sled more often. More sledding = more time spent / opportunity for injuries, without implying that the sled is to blame.

(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
This would be true of wooden and plastic sleds, so it wouldn't help us compare.

(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
Since the metric we're given is "number of children injured," this wouldn't make a difference. If the sled injures one person or multiple people at a time, it could still be judged unsafe.

The answer is C.

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

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Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.
VivianKerr GMAT Instructor
Joined
17 Dec 2010
Posted:
1035 messages
Followed by:
364 members
Upvotes:
474
Post Mon Jul 21, 2014 11:59 pm
You're welcome! Notice the key to this Weaken question is the key to MOST GMAT CR: identify the question stem and the expectations that go along with it, take notes on your yellow scratch pad, then make a Prediction for what you think the correct answer should be!

Most people miss CR when they cut corners on strategy. Smile I know I do!

_________________
Vivian Kerr
GMAT Rockstar, Tutor
http://www.GMATrockstar.com
http://www.yelp.com/biz/gmat-rockstar-los-angeles

Former Kaplan and Grockit instructor, freelance GMAT content creator, now offering affordable, effective, Skype-tutoring for the GMAT at $150/hr. Contact: GMATrockstar@gmail.com

Thank you for all the "thanks" and "follows"! Smile

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