A large group of hyperactive children whose regular diets : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 22:56

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A large group of hyperactive children whose regular diets

Author Message
TAGS:

### Hide Tags

CEO
Joined: 15 Aug 2003
Posts: 3460
Followers: 67

Kudos [?]: 862 [0], given: 781

A large group of hyperactive children whose regular diets [#permalink]

### Show Tags

23 Sep 2003, 08:21
1
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

69% (03:36) correct 31% (02:17) wrong based on 85 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 ten 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

If you have any questions
New!
Manager
Joined: 15 Sep 2003
Posts: 73
Location: california
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

23 Sep 2003, 11:10
I would say B....it shows that there might be an alternate causation...
Manager
Joined: 25 Jun 2003
Posts: 93
Followers: 1

Kudos [?]: 0 [0], given: 0

### Show Tags

23 Sep 2003, 12:04
Another vote for B.. as it shows other reasons for behavioral problems
_________________

Brainless

CEO
Joined: 15 Aug 2003
Posts: 3460
Followers: 67

Kudos [?]: 862 [0], given: 781

### Show Tags

23 Sep 2003, 13:25
Brainless wrote:
Another vote for B.. as it shows other reasons for behavioral problems

right again..i selected C...i see why C is wrong
Intern
Joined: 23 Aug 2003
Posts: 19
Location: ny
Followers: 0

Kudos [?]: 0 [0], given: 0

### Show Tags

23 Sep 2003, 14:09
praetorian123 wrote:
right again..i selected C...i see why C is wrong

It is not as important to know exact numbers of children w/reduced behavioral problems (you are given percentages so you already know that there was a relative decrease in behavioral problems) as it is to know that the decrease in behavioral problems cannot be attributable to something outside the diet change.

A control group (the lack of which is what choice B cites as the problem with the study) is necessary to establish that the diet change was not due to a factor external to the study.
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 245 [0], given: 0

### Show Tags

23 Sep 2003, 23:44
I for one vote for E. The argument states that the additives contribute to behavior problems in hyperactive children. E states that opposite: the additives in fact inhibit behavior problems. After the experiment, there can be, for example, 75% of problem children.

B is wrong, for it says that only children who changed to a low-additive diet were studied. The argument does not support it. The group was on one diet; the same group was on the other. The same group was studied: originally 60%, after 30%.
Intern
Joined: 23 Aug 2003
Posts: 19
Location: ny
Followers: 0

Kudos [?]: 0 [0], given: 0

### Show Tags

24 Sep 2003, 09:18
stolyar wrote:
I for one vote for E. The argument states that the additives contribute to behavior problems in hyperactive children. E states that opposite: the additives in fact inhibit behavior problems. After the experiment, there can be, for example, 75% of problem children.

But there is no evidence for E. 60% had behavior problems before the diet, but only 30% had behavior problems after the diet. While some children may indeed have increased behavior problems after the diet, there is no evidence of that, and overall, behavior problems decreased.

stolyar wrote:
B is wrong, for it says that only children who changed to a low-additive diet were studied. The argument does not support it. The group was on one diet; the same group was on the other. The same group was studied: originally 60%, after 30%.

B is correct in that there was only one group of children studied. It's true that this one group was evaluated before and after the diet change... but a a second group should be studied during the same time period that does not undergo a diet change. What if the school implemented a new discpline system during the study? If you only evaluated one group, you might attribute the decrease in problems to the diet change. But if you looked at two groups (one with a diet change and one without), and there were similar decreases in behavior problems, you wouldn't be as quick to say the decrease was due to a diet change. (In fact it would seem the decrease was due to the new discipline system.)
GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10531
Followers: 918

Kudos [?]: 203 [0], given: 0

Re: A large group of hyperactive children whose regular diets [#permalink]

### Show Tags

30 Nov 2014, 02:25
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: A large group of hyperactive children whose regular diets   [#permalink] 30 Nov 2014, 02:25
Similar topics Replies Last post
Similar
Topics:
10 According to recent studies, people whose diet is 19 16 May 2015, 21:31
3 A study by a group of dentists has concluded that regular 7 23 May 2013, 22:40
19 The University sponsors both a Volunteers group, whose 14 07 Aug 2010, 06:30
A large group of hyperactive children whose regular diets 5 22 Jul 2008, 15:17
Choi : All other factors being equal , children whose 5 04 Jul 2007, 06:52
Display posts from previous: Sort by