Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 20 Jul 2019, 17:21

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

A large group of hyperactive children whose regular diets included foo

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 56304
A large group of hyperactive children whose regular diets included foo  [#permalink]

Show Tags

New post 03 May 2018, 02:51
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

61% (02:28) correct 39% (02:31) wrong based on 174 sessions

HideShow timer Statistics


A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent of the children exhibited behavior problems; after the change in diet, only 30 percent did so. On the basis of these data, it can be concluded that food additives can contribute to behavior problems in hyperactive children.

The evidence cited fails to establish the conclusion because

(A) there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake

(B) there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied

(C) exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given

(D) there is no evidence that the behavior of some of the children was unaffected by additives

(E) the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed

_________________
Director
Director
avatar
P
Joined: 02 Oct 2017
Posts: 727
Re: A large group of hyperactive children whose regular diets included foo  [#permalink]

Show Tags

New post 20 May 2018, 02:36
2
Conclusion -food additives can contribute to behavior problems in hyperactive children.

We need to weaken the above conclusion

During the experiment only changes are observed when changing diet

But What about changes being observed when no diet is changed.is it consistent with experiment result or not

Without this information we cannot say conclusion is correct or not

B correctly states this

Give kudos if it helps

Posted from my mobile device
_________________
Give kudos if you like the post
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4512
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User
Re: A large group of hyperactive children whose regular diets included foo  [#permalink]

Show Tags

New post 20 May 2018, 08:48
Bunuel wrote:
A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent of the children exhibited behavior problems; after the change in diet, only 30 percent did so. On the basis of these data, it can be concluded that food additives can contribute to behavior problems in hyperactive children.

The evidence cited fails to establish the conclusion because

(A) there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake

(B) there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied

(C) exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given

(D) there is no evidence that the behavior of some of the children was unaffected by additives

(E) the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed


(A) Proportionate comparison is incorrect.
(B) True, the entire population was studied a control group was not taken as such we can not be certain about the results/observations.
(C) Number of children is not the concern here.
(D) Out of scope.
(E) Frequency of Behaviour problem - Not discussed, hence out of context.

Correct Answer must be (B)
_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Manager
Manager
avatar
B
Status: Trying...
Joined: 15 Aug 2016
Posts: 104
Location: India
GMAT 1: 660 Q51 V27
GMAT 2: 690 Q48 V37
GPA: 4
WE: Consulting (Internet and New Media)
Re: A large group of hyperactive children whose regular diets included foo  [#permalink]

Show Tags

New post 17 Aug 2018, 10:48
This question reminds me of every argument that I have with my boss regarding the effectiveness of a campaign or strategy by looking at absolute numbers & not considering a control group :D
Intern
Intern
avatar
B
Joined: 30 Apr 2018
Posts: 7
Location: United States
GMAT 1: 690 Q47 V38
GPA: 4
Re: A large group of hyperactive children whose regular diets included foo  [#permalink]

Show Tags

New post 17 Aug 2018, 11:02
Bunuel wrote:
A large group of hyperactive children whose regular diets included food containing large amounts of additives was observed by researchers trained to assess the presence or absence of behavior problems. The children were then placed on a low-additive diet for several weeks, after which they were observed again. Originally nearly 60 percent of the children exhibited behavior problems; after the change in diet, only 30 percent did so. On the basis of these data, it can be concluded that food additives can contribute to behavior problems in hyperactive children.

The evidence cited fails to establish the conclusion because

(A) there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake

(B) there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied

(C) exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given

(D) there is no evidence that the behavior of some of the children was unaffected by additives

(E) the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed




(A) there is no evidence that the reduction in behavior problems was proportionate to the reduction in food-additive intake ----- We just need an answer in yes/no terms whether the reduction in behavior problems was caused by reduction in food-additive intake and do no need to know the degree of reduction. Hence out of scope.

(B) there is no way to know what changes would have occurred without the change of diet, since only children who changed to a low-additive diet were studied ----- Correct. It may be possible that a reduction in behavior problems was observed in even in children who still continued the same diet. to arrive at the the desired conclusion, we need to rule out this possibility.

(C) exactly how many children exhibited behavior problems after the change in diet cannot be determined, since the size of the group studied is not precisely given ----- We do not need a precise number as we already have the percentage of the children in question

(D) there is no evidence that the behavior of some of the children was unaffected by additives ----Out of scope. We just need to establish that a low-additives diet leads to a reduction in behavior problems in children

(E) the evidence is consistent with the claim that some children exhibit more frequent behavior problems after being on the low-additive diet than they had exhibited when first observed---- No such claims have been made in the data.
GMAT Club Bot
Re: A large group of hyperactive children whose regular diets included foo   [#permalink] 17 Aug 2018, 11:02
Display posts from previous: Sort by

A large group of hyperactive children whose regular diets included foo

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne