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Advertisement: Do you want to be more energetic, vigorous, and physica

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Advertisement: Do you want to be more energetic, vigorous, and physica [#permalink]

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New post 16 May 2017, 12:18
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A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

40% (01:22) correct 60% (01:27) wrong based on 129 sessions

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Advertisement: Do you want to be more energetic, vigorous, and physically fit? Take a daily supplement of Vita-plus, a vitamin combination containing additional proprietary ingredients. Our studies using hundreds of volunteers show that after just one week of taking 2 capsules daily, participants report being more energetic and alert on average than the average level reported by the National Institutes of Health survey of all Americans.

Which of the following would most strengthen the advertisement’s claim that Vita-Plus supplements make one more energetic and alert?

(A) Those who voluntarily chose to take more than 2 capsules daily reported energy levels even greater than those who took only 2 capsules.
(B) The volunteers were randomly selected from all those who answered a newspaper advertisement and were willing to pay for the cost of the Vita-Plus capsules.
(C) At the beginning of the study, the volunteers’ reports on alertness showed levels on average no different from the average level reported by the National Institutes of Health.
(D) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers also reported increased levels of alertness and energy.
(E) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers reported no increase in alertness or energy.

Source: Nova GMAT
[Reveal] Spoiler: OA

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Re: Advertisement: Do you want to be more energetic, vigorous, and physica [#permalink]

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New post 01 Oct 2017, 22:43
hello Expert,

Why answer is option 'e'?

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Re: Advertisement: Do you want to be more energetic, vigorous, and physica [#permalink]

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New post 02 Oct 2017, 00:16
SajjadAhmad wrote:
Advertisement: Do you want to be more energetic, vigorous, and physically fit? Take a daily supplement of Vita-plus, a vitamin combination containing additional proprietary ingredients. Our studies using hundreds of volunteers show that after just one week of taking 2 capsules daily, participants report being more energetic and alert on average than the average level reported by the National Institutes of Health survey of all Americans.

Which of the following would most strengthen the advertisement’s claim that Vita-Plus supplements make one more energetic and alert?

(A) Those who voluntarily chose to take more than 2 capsules daily reported energy levels even greater than those who took only 2 capsules.
(B) The volunteers were randomly selected from all those who answered a newspaper advertisement and were willing to pay for the cost of the Vita-Plus capsules.
(C) At the beginning of the study, the volunteers’ reports on alertness showed levels on average no different from the average level reported by the National Institutes of Health.
(D) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers also reported increased levels of alertness and energy.
(E) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers reported no increase in alertness or energy.

Source: Nova GMAT


IMO answer should be E.
We need to strengthen the claim that taking 2 capsules of vita plus supplements make one "both"energetic and alert.


(A) Those who voluntarily chose to take more than 2 capsules daily reported energy levels even greater than those who took only 2 capsules. Does not say that 2 capsules would make one more energetic. More than 2 are surely more energetic.
(B) The volunteers were randomly selected from all those who answered a newspaper advertisement and were willing to pay for the cost of the Vita-Plus capsules. - Does not strengthen the claim. OOS.
(C) At the beginning of the study, the volunteers’ reports on alertness showed levels on average no different from the average level reported by the National Institutes of Health. - There were no difference in alertness but there can be difference in energy levels. The argument would fall apart if this was the case. Surely doesn't strengthen.
(D) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers also reported increased levels of alertness and energy. Weakens the conclusion.
(E) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers reported no increase in alertness or energy. - This seems right because it says cellulose cannot increase levels of alertness and energy. Hence it must be vitamin, which is present in supplements.
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Re: Advertisement: Do you want to be more energetic, vigorous, and physica [#permalink]

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New post 02 Oct 2017, 01:59
I understand C talks only about alertness but still it partly strength end the argument. At the same time E implies: no vitamin -> no increase, therefore the observed increase is because of the vitamin. This correlation cannot establish causal relationship. I feel C strengthens more than E does, by eliminating the possibility that the sample itself is biased.

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Re: Advertisement: Do you want to be more energetic, vigorous, and physica [#permalink]

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New post 02 Oct 2017, 15:14
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(C) At the beginning of the study, the volunteers’ reports on alertness showed levels on average no different from the average level reported by the National Institutes of Health.

(E) Some of the volunteers were given capsules that solely contained cellulose, an inert substance with no vitamins or other health inducing substances. Those volunteers reported no increase in alertness or energy.

Between C and E

Option C only tells us that volunteers alertness levels were very similar to general population. We cannot conclude that capsules are the reason for increased alertness. There may be others reasons for alertness.

Option E- this choice gives us a reason to believe that capsules are the cause of alertness. The volunteers who did not receive the capsules showed no increase in alertness levels whereas volunteers who were given capsules showed increased alertness ( From Premise).
Option E adds new additional information,which strengthens the conclusion.

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Re: Advertisement: Do you want to be more energetic, vigorous, and physica   [#permalink] 02 Oct 2017, 15:14
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