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A recent research study of undergraduate students analyzed [#permalink]
04 Aug 2012, 14:09

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Question Stats:

49% (02:53) correct
51% (01:57) wrong based on 394 sessions

A recent research study of undergraduate students analyzed the effects of music on human emotions. Each of the 200 participants attended at least 1 two-hour concert of classical music per week over the course of 12 weeks of their spring semester. At the end of the experiment, all of the students filled out a questionnaire assessing their emotional state. Based on the results of the questionnaires, all of the 10 students who attended the greatest number of concerts reported lower stress levels and higher satisfaction with their lives. Also, most of the 20 students who attended the fewest number of concerts reported below-average levels of emotional comfort.

Which of the following must be true based on the evidence presented above?

A) Most of the 200 participants improved their emotional state and lowered their stress levels. B) During each week of the experiment, the participants spent at least 2 hours less on their academic work as a result of concert attendance. C) Listening to classical music for at least 2 hours per week improves the emotional well-being of the majority of young adults. D) More than 6 participants attended at least 14 concerts during the course of the experiment. E) At least some of the students participated in the study in order to gain free access to classical concerts.

Re: A recent research study of undergraduate students analyzed [#permalink]
05 Aug 2012, 04:32

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now figured it out. All attended atleast 12 concerts . as all attended atleast one concert per week. so bottom 20 attended 12 concerts each. ( at least ) middle 170 have to attend atleast 1 more than the least number that is 12 and one less than the highest number. That is they attended 13 atleast. top 10 has to attend atleast one more that the middle 170 that is they attended atleast 14 .. Hence more that 6 people attended atleast 14 concers

Re: A recent research study of undergraduate students analyzed [#permalink]
05 Aug 2012, 16:41

Expert's post

mandyrhtdm wrote:

now figured it out. All attended atleast 12 concerts . as all attended atleast one concert per week. so bottom 20 attended 12 concerts each. ( at least ) middle 170 have to attend atleast 1 more than the least number that is 12 and one less than the highest number. That is they attended 13 atleast. top 10 has to attend atleast one more that the middle 170 that is they attended atleast 14 .. Hence more that 6 people attended atleast 14 concers

Well explained, mandyrhtdm!

Inference problems--characterized by language in the question stem like "based on the evidence presented above"--ask you to accept the information in the stimulus as fact, and draw conclusions from it. When the facts are abstract or complex, it can be very difficult to predict an answer. But when there are numbers in the stem, it's often the case that the correct answer presents itself to a little mathematical reasoning!

Here, because we have "20" attending the "fewest" number of concerts, and "10 attending the "most" number of concerts, we have to have the remaining 170 somewhere in the middle. And since the fewest possible number of concerts is 12, the middle 170 must have each attended at least 13 concerts--and, accordingly, the remaining 10 have each attended an absolute floor of 14 concerts. (D) is correct.

For the record: (A) isn't supported--we have information on 30 out of 200, so there is no way we can support a "most" claim. (B) is out of scope; we don't know where the hours come from, not to mention that it's possible students are studying at the concerts! (C) also goes may beyond the scope of the stimulus. Finally, (E) speculates baselessly on the motivation of students. This is a reasonable supposition, but it's not actually based on anything in the text!

Re: A recent research study of undergraduate students analyzed [#permalink]
05 Aug 2012, 21:01

A) Most of the 200 participants improved their emotional state and lowered their stress levels. - This cannot be true as the evidence states that top 10 group experienced less stress and most of the bottom 20 experienced below average level of comfort. The rest 170 may or may not have experienced any change in their emotional well being - Incorrect B) During each week of the experiment, the participants spent at least 2 hours less on their academic work as a result of concert attendance. - It is already stated in the passage that 1 two-hour concert is mandatory for all participants. The participants may or may not have cut back their academic work for attending concert. - Incorrect C) Listening to classical music for at least 2 hours per week improves the emotional well-being of the majority of young adults. - As already stated in the explanation for (A), the results donot propose a concrete theory on whether listening to classical music improves emotional well-being - Incorrect D) More than 6 participants attended at least 14 concerts during the course of the experiment. - The 10-170-20 split explains this scenario perfectly - Correct E) At least some of the students participated in the study in order to gain free access to classical concerts. - Highly Unlikely scenario. The whole arragement might have been part of an assignment too. Too many unknowns. - Incorrect

Re: A recent research study of undergraduate students analyzed [#permalink]
09 Aug 2012, 10:08

We need only 1 statement to answer this one.

the statement is- all of the 10 students who attended the greatest number of concerts reported lower stress levels and higher satisfaction with their lives

greatest no of concerts must be >1 i.e minimum 2 because everybody has attended one session per week.

thus 20 students attended minimum 12 *2=24 sessions.

Re: A recent research study of undergraduate students analyzed [#permalink]
29 Oct 2013, 17:22

Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Can you please explain this. how did we get 13 and 14 sessions as explained in the previous explanations. there are only 12 weeks and 1 session per week

Re: A recent research study of undergraduate students analyzed [#permalink]
28 Jan 2014, 09:47

As for me.....

Selection of the correct answer in this case, due to figurative analysis , was difficult- but the balance 4 answers being definitely incorrect made this a prospect answer....

Re: A recent research study of undergraduate students analyzed [#permalink]
29 Jan 2014, 13:05

1

This post received KUDOS

Abdul29 wrote:

I sort of get why D is the OA. But isn't the statement open-ended? "more than" seems a little broad. Someone please tell me what I'm missing.

It is a must be true question.

Fact 1: Everyone attended at least 12 concerts Fact 2: There are 20 people who attended the least number of concerts = 12 concerts Fact 3: There are 10 people who attended the greatest number of concerts

Now, how many concerts these 10 people have attended ? [possible numbers: 14, 15, 16...]. It cannot be 13, because between top 10 and bottom 20, we have a middle group (the left out 170).

So we can say, at least 10 people attended 14 or more concerts.

The option says more than 6 people, which fits to at least 10 people zone.

Hope it is clear.

_________________

"Appreciation is a wonderful thing. It makes what is excellent in others belong to us as well." ― Voltaire Press Kudos, if I have helped. Thanks! shit-happens-my-journey-to-172475.html#p1372807

Re: A recent research study of undergraduate students analyzed [#permalink]
29 Jan 2014, 13:18

ConnectTheDots wrote:

Abdul29 wrote:

I sort of get why D is the OA. But isn't the statement open-ended? "more than" seems a little broad. Someone please tell me what I'm missing.

It is a must be true question.

Fact 1: Everyone attended at least 12 concerts Fact 2: There are 20 people who attended the least number of concerts = 12 concerts Fact 3: There are 10 people who attended the greatest number of concerts

Now, how many concerts these 10 people have attended ? [possible numbers: 14, 15, 16...]. It cannot be 13, because between top 10 and bottom 20, we have a middle group (the left out 170).

So we can say, at least 10 people attended 14 or more concerts.

The option says more than 6 people, which fits to at least 10 people zone.

Hope it is clear.

+Kudos.

I took the "more than" to an extreme level, I must say. Clear as mud, cheers.

Re: A recent research study of undergraduate students analyzed [#permalink]
30 Jan 2014, 07:29

1. A recent research study of undergraduate students analyzed the effects of music on human emotions. 2. Each of the 200 participants attended at least 1 two-hour concert of classical music per week over the course of 12 weeks of their spring semester. 3. All of the 10 students who attended the greatest number of concerts reported lower stress levels and higher satisfaction with their lives. 4. Most of the 20 students who attended the fewest number of concerts reported below-average levels of emotional comfort.

Which of the following must be true based on the evidence presented above?

A) Most of the 200 participants improved their emotional state and lowered their stress levels.MAY NOT BE TRUE ...SEE 4. B) During each week of the experiment, the participants spent at least 2 hours less on their academic work as a result of concert attendance.IRRELEVANT... JUST TALK OF STRESS LEVELS C) Listening to classical music for at least 2 hours per week improves the emotional well-being of the majority of young adults.YOUNG ADULTS WERE NOT CONSIDERED IN THE STUDY BUT UNDERGRADUATES D) More than 6 participants attended at least 14 concerts during the course of the experiment.CORRECT....20 STUDENTS ATTENDED 12 HOURS OF CONCERT...IE MINIMUM...( SEE POINT 2 ABOVE) .....BALANCE 180 ATTENDED MORE THAN 12 HOURS OF THE CONCERT....IE 13, 14 .....OR MORE.....10 ATTENDED MAXIMUM NUMBER OF HOURS..... THIS MAXIMUM CANNOT BE 13 HOURS AS OTHER WISE HOW MANY HOURS WOULD THE BALANCE 170 HAVE ATTENDED ?HENCE THOSE WHO ATTENDED 14 OR MORE HOURS HAVE TO BE AT LEAST 10 IE THE MAX ONES.......SO AS TO MAKE SPACE FOR THE BALANCE 170 TO OCCUPY 13 HOURS OF CONCERT E) At least some of the students participated in the study in order to gain free access to classical concerts.WHY ONE ATTENDED THE CONCERT IS NOT IMPORTANT.....

Re: A recent research study of undergraduate students analyzed [#permalink]
02 Mar 2014, 08:23

its (D) More than 6 participants attended at least 14 concerts during the course of the experiment. Our facts have proved that there are at least three levels of concert goers: fewest (20 students), greatest (10 students) and "the rest" (170 students). The fewest attended at least 12 concerts (by definition of the study); thus, "the rest" must have attended at least 13 concerts and "the greatest" must have attended at least 14 concerts. Since "the greatest" includes 10 students, it is true that More than 6 participants attended at least 14 concerts during the course of the experiment.

gmatclubot

Re: A recent research study of undergraduate students analyzed
[#permalink]
02 Mar 2014, 08:23