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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
Picked D as the correct answer

however E) says something i observed some have missed- if in the study one type of treadmill was purchased earlier does'nt it mean they were observed over a longer period of time than the non motorized treadmill ?

what is the source of the question?
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
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YashYashkratos wrote:
Picked D as the correct answer

however E) says something i observed some have missed- if in the study one type of treadmill was purchased earlier does'nt it mean they were observed over a longer period of time than the non motorized treadmill ?

what is the source of the question?


The source is GMAT Prep (Focus). I encountered it on one of the free practice exams.

I picked E because of that very reason. It's reasonable that 5-year old treadmills are more likely to require repair than 1-year old treadmills, regardless of type.

In retrospect, if E had said "People who purchased new treadmills within the past year are not far more likely than people who purchased treadmills five years ago to have purchased nonmotorized treadmills" then IMO this would have been as valid as D.
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According to a recent large-scale survey of peoplewho had purchased [#permalink]
According to a recent large-scale survey of people who had purchased new home exercise equipment during the past five years, ten percent of motorized treadmills purchased during that period had required repairs more than once, whereas only two percent of nonmotorized treadmills had ever needed repair. Therefore, people who want to buy a treadmill for regular workouts can rely on having their routine disrupted far less often if they buy a nonmotorized rather than a motorized treadmill.

Which of the following is an assumption on which the argument depends?

A. Nonmotorized treadmills provide at least as good a workout for people who use them regularly as motorized treadmills do.
B. At least as many people in the survey had purchased motorized treadmills as had purchased nonmotorized treadmills.
C. Motorized treadmills do not generally take longer to repair than nonmotorized treadmills.
D. People who have bought treadmills are not far more likely to use them regularly over the long term if they are motorized than if they are nonmotorized.
E. People who purchased new treadmills within the past year are not far more likely than people who purchased treadmills five years ago to have purchased motorized treadmills.


The passage talks about people who bought gym equipment for their homes. 10 out of 100 who bought motorized treadmills had to get them repaired multiple times. Only 2 out of 100, however, who bought non-motorized treadmills had to repair them. The theory therefore is that if you want something that doesn't interrupt your exercise routine you should get non-motorized treadmills.

We're asked to look for an assumption.

(D) is the answer. If people who bought motorized treadmills were far more likely to use them compared to non-motorized, then the chances of them getting damaged is far higher. Imagine a smartphone you buy but only use once a year. Chances are it won't get broken even if you keep it for 10 years. That doesn't necessarily mean the device itself was more solidly built.
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
Was debating between B and D. Went with B for the following reason: While the question does deal with a percentage the number of each type of treadmill does still matter. It could be possible that the a smaller sample of motorized was picked but that size had a larger number of failures due to sampling bias.

Is this too much assumption for the question?
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
Guntabulla wrote:
Was debating between B and D. Went with B for the following reason: While the question does deal with a percentage the number of each type of treadmill does still matter. It could be possible that the a smaller sample of motorized was picked but that size had a larger number of failures due to sampling bias.

Is this too much assumption for the question?

­i did the same , if anyone can answer as to why this is wrong
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
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Guntabulla wrote:
Was debating between B and D. Went with B for the following reason: While the question does deal with a percentage the number of each type of treadmill does still matter. It could be possible that the a smaller sample of motorized was picked but that size had a larger number of failures due to sampling bias.

Is this too much assumption for the question?

­Let's take a look at (B).

B. At least as many people in the survey had purchased motorized treadmills as had purchased nonmotorized treadmills.

Notice that (B) doesn't say "The number of people who purchased motorized treadmills was not tiny."

It basically says just that the number of people who purchased motorized treadmills was no less than the number who purchased nonmotorized treadmills.

So, we can't run with (B) and interpret it as saying that the number of people who purchased motorized treadmills was not tiny because that interpretation involves a new meaning that (B) doesn't have. After all, "at least as many" and "was not tiny" have quite different meanings.

Thus, while it's true that the argument relies on the assumption that the number of people who purchased motorized treadmills was not so tiny that the statistics are unreliable, since that's not what (B) says or logically implies, (B) is not a necessary assumption.
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
KarishmaB Can you please throw some more light on option B and D ? chetan2u GMATNinja
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
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MasteringGMAT wrote:
According to a recent large-scale survey of people who had purchased new home exercise equipment during the past five years, ten percent of motorized treadmills purchased during that period had required repairs more than once, whereas only two percent of nonmotorized treadmills had ever needed repair. Therefore,cpeople who want to buy a treadmill for regular workouts can rely on having their routine disrupted far less often if they buy a nonmotorized rather than a motorized treadmill.

Which of the following is an assumption on which the argument depends?

A. Nonmotorized treadmills provide at least as good a workout for people who use them regularly as motorized treadmills do.
B. At least as many people in the survey had purchased motorized treadmills as had purchased nonmotorized treadmills.
C. Motorized treadmills do not generally take longer to repair than nonmotorized treadmills.
D. People who have bought treadmills are not far more likely to use them regularly over the long term if they are motorized than if they are nonmotorized.
E. People who purchased new treadmills within the past year are not far more likely than people who purchased treadmills five years ago to have purchased motorized treadmills.

­
Premises:
Of people who purchased treadmills in last 5 years, 
Motorized treadmills - 10% required repairs more than once
Nonmotorized treadmills -  Only 2% had ever needed repairs

Conclusion: People who want to buy a treadmill for regular workouts can rely on having their routine disrupted far less often if they buy a nonmotorized rather than a motorized treadmill.

For now, the conclusion seems to make sense. Those who want to do regular workouts (say everyday), will have their routines disturbed much less if they buy the nonmotorized one. Looks like it. After all, only 2% of them ever need repairs. But there is an assumption here. So let's look at the options. At first thought, I can't think of what the assumption may be. 

A. Nonmotorized treadmills provide at least as good a workout for people who use them regularly as motorized treadmills do.

Irrelevant. The only factor being discussed is 'routine disruption'. Whether the workout would be better or worse (whatever the parameters for measuring that is)  is not being discussed.  

B. At least as many people in the survey had purchased motorized treadmills as had purchased nonmotorized treadmills.

This is not required. We know that it was a large-scale survey. So many would have bought both types. The sampling size for one, even if it is smaller than the other, doesn't mean it is not representative. We are given large-scale so that indicates that it is representative. 
Say if it was a survey of 10,000 people and 4000 bought motorized while 6000 bought nonmotorized, does it make any difference? 
Even if we negate it and say that fewer people bought the motorized one, so what? 
The survey results talk about the percentage of repairs, not absolute values. So of 4000 motorized ones, 400 required repairs more than once. While of 6000 nonmotorized ones, barely 120 required repairs ever. 
Since we have results in percentage terms, number of treadmills is irrelevant. 

C. Motorized treadmills do not generally take longer to repair than nonmotorized treadmills.

Length of disruption is irrelevant.

D. People who have bought treadmills are not far more likely to use them regularly over the long term if they are motorized than if they are nonmotorized.

The length of use does impact the frequency of repairs.
Say of the 100 people who buy motorized one, all 100 use them regularly. Then 10% need repairs multiple times. They are getting used regularly after all. 
Say of the 100 people who buy unmotorized one, only 5 use them regularly. The rest use them for a few days and then let them stand (as we know happens very often with treadmills!). Then the 95 will obviously never need repairs if they are not getting used or used rarely. Of 5, if 2 go for repairs, that is 40%. Suddenly the unmotorized ones don't look so good. 
If people are far more likley to use the motorized ones regularly, then we would expect more frequent repairs for them.

Negate it:  People who have bought treadmills are far more likely to use them regularly over the long term if they are motorized than if they are nonmotorized.

Notice the use of "far more likely". This is a hint that the author is looking at an extreme difference as taken in the example. Our conclusion breaks here. 

E. People who purchased new treadmills within the past year are not far more likely than people who purchased treadmills five years ago to have purchased motorized treadmills.

There is no comparison between "one year ago" and "5 years ago" hence this is irrelevant. 

Answer (D)

Discussion on Assumption Questions: https://youtu.be/O0ROJfljRLU
A Hard Assumption Question: https://youtu.be/0j4tovGifIg

 
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Re: According to a recent large-scale survey of peoplewho had purchased [#permalink]
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