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In an experiment, two different types of recorded music were

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Joined: 04 Aug 2015
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Concentration: Leadership, Technology
GMAT 1: 700 Q50 V35
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Re: In an experiment, two different types of recorded music [#permalink]

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New post 19 Feb 2017, 06:12
In an experiment, two different types of recorded music were played for neonates in adjacent nurseries in a hospital. In nursery A, classical music was played; in nursery B, rock music was played. After two weeks, it was found that the babies in nursery A cried less, suffered fewer minor ailments, and gained more weight than did the babies in nursery B.

Which of the following additional experimental data would support the hypothesis that classical music is beneficial to the development of newborn?

Well, to support the hypothesis, one information that might help us is whether the sample space was similar for both the experiments. But that would only help us compare the classical-music-effect with the rock-music-effect. There can be two facets:
(1) The classical music might be beneficial to the development of the newborn
(2) The classical music might not have any effect at all but the rock music might have a negative effect on the growth of the newborn.

In order to establish the fact that the classical music has a positive effect on the development of the newborn, we need a set up where the growth of the newborns under classical music environment is compared with the growth of newborns under no such environment. Of course considering "newborns" as a uniform sample space.


(A) The neonates in a nursery where no music was played fared better than those in nursery B. This doesn't establish any relation with the nursery A. The one thing that we can infer from this option is that there might be some deteriorating effect of rock music on the growth of the newborns.

(B) Nursery A contained 15 percent more premature babies than nursery B. Since this option brings in the idea of premature babies, we now know that the sample space is not uniform i.e. all the babies are not "same". So the groups can be biased and thus won't produce the results to prove the hypothesis.

(C) The newborns in nursery A cried less, suffered fewer minor ailments, and gained more weight than did newborns in a nursery with no music. So here we make a comparison between the classical-music-newborns with the newborns that were not exposed to any music.

(D) The music played in nursery A was louder than that played in nursery B. Pretty much out of context of the problem.

(E) The ratio of nurses to newborns in nursery B was 1 to 4; in nursery A, it was 1 to 6. Pretty much out of context of the problem.

Thus, option C.

PS: You already provided the answer while copying the options from the source. :lol:
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Re: In an experiment, two different types of recorded music [#permalink]

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New post 20 Mar 2017, 11:00
Please can you let me know if option (E) is out of scope or its the contender for the answer
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Re: In an experiment, two different types of recorded music were [#permalink]

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New post 20 Mar 2017, 20:29
Merged duplicate topics! Please, search question before creating discussion.
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Re: In an experiment, two different types of recorded music were   [#permalink] 20 Mar 2017, 20:29

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In an experiment, two different types of recorded music were

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