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

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Senior RC Moderator
Joined: 02 Nov 2016
Posts: 4106
GPA: 3.39

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Updated on: 13 Jul 2019, 04:39
10
00:00

Difficulty:

95% (hard)

Question Stats:

39% (01:56) correct 61% (02:00) wrong based on 254 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
Difficulty Level: 750

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Last edited by SajjadAhmad on 13 Jul 2019, 04:39, edited 2 times in total.
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01 Oct 2017, 22:43
hello Expert,

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Joined: 15 Mar 2017
Posts: 38
Location: India
GMAT 1: 720 Q50 V37
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02 Oct 2017, 00:16
1
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

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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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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02 Oct 2017, 15:14
1
(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).
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02 Dec 2018, 17:52
option E talks about some.Option B talks about all. So , option B is more preferable.
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23 Dec 2018, 07:44
1
Pattern X --------> Y

Conc : Have my pill to feel active / energetic.
Asumpt : My Pill actually works and fills you with a lot of energy
Pre think : What if 1) Something else causes this increase . 2) NIHS data is represntative for all americans.
What to look for 1) Y-----> X (should not happen) 2) No X --- No Y 3) Eliminate other causes.

Between C and E

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. Try negating (Simple english negating not playing with keywords and all , maybe the correct word is falsifying) : No different has two aspects :
1 That the average level of alertness of volunteers was much lesser. ------> Even if it was much lesser, we can say that it increased by pills. This case strengthens.
2 The average level of volunteers was already too high ----> NIHS data is not representative ----> Prethink 2 -----> Pills had nothing to do with this, levels were already high. This case weakens.

All in, C presents a dichotmoy. OUT

(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.
Simple logic No Y ------> No X.
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Re: Advertisement: Do you want to be more energetic, vigorous, and physica   [#permalink] 23 Dec 2018, 07:44
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