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Register now and save up to $200 Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code Critical reasoning OG 13 tagged by: ceilidh.erickson This topic has 1 expert reply and 3 member replies anksm22 Master | Next Rank: 500 Posts Joined 02 Jul 2014 Posted: 124 messages Followed by: 1 members Critical reasoning OG 13 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 Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums! GMAT/MBA Expert ceilidh.erickson GMAT Instructor Joined 04 Dec 2012 Posted: 1707 messages Followed by: 224 members Upvotes: 1443 Top Reply 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! Thanked by: gmatdestroyer1 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 Top Reply 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. 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

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ceilidh.erickson GMAT Instructor
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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
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Posted:
1035 messages
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364 members
Upvotes:
474
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. 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"!

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