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In a recent study, each member of two groups of people Group A (compos

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In a recent study, each member of two groups of people Group A (compos  [#permalink]

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07 Jun 2017, 03:57
2
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Difficulty:

45% (medium)

Question Stats:

66% (02:05) correct 34% (02:11) wrong based on 317 sessions

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LSAT CR 42 9.PNG [ 78.34 KiB | Viewed 2245 times ]

Source: LSAT
The question is a bit tricky

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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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07 Jun 2017, 22:31
I think the answer should be B since it provides information which does not directly impact the result of the experiment. All other options provide information which should aid the conclusion as they directly influence the groups BEFORE the calls were made.

Would appreciate a kudos if you like my solution!
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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08 Jun 2017, 02:19
1
OE:

Premise:
As a person ages, his/her memory deteriorates. This is proved by evidencing the lapses in both groups. One memory doesn't have an effect on age.

Keyword:
The question stem is a little tricky. It is a strengthen question. So hunt for the additional information that can bolster the conclusion

POE
A.The correlation is between age and memory not numbers Wrong
B. This option intends to address the legitimacy of the research. This must be true. If different people answer the calls, then there might be other reason for the lapses. For example, the person attending the call might intentionally delay in answering the query. Correct
C. This is mere an inference. Wrong
D. This information does not address the correlation between the age and memory Wrong
E. This addresses that there is no delay in the starting time of the event. Irrelevant Wrong
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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11 Jul 2017, 02:37
Could somebody explain...

Dear Experts, especcially GMATNinja I need your help I did not understand why correct answer is B
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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11 Jul 2017, 13:33
Can someone please help me with why D is incorrect and B is right? I was stuck between these two and chose D instead
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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11 Jul 2017, 22:52
Please provide a reason why is it B and not C
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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19 Jul 2017, 10:11
1
yell2012 wrote:
Could somebody explain...

Dear Experts, especcially GMATNinja I need your help I did not understand why correct answer is B

This is a strengthen "except" question so 4 of the answer choices will strengthen the argument whereas one answer choice will have no impact.

The arguments conclusion in that as a person ages, he/she does not suffer from at least one kind of memory loss.

If you pre-think about potential loopholes in this argument (strengthening is about closing loopholes), we could possible think of difference in the group numbers - what if the old people group had only 5 members are 1 failed to call, whereas the young group had 100 members and 14 forgot, then clearly group of the younger folks is better (20% vs 14%) and the conclusion fails. Alternatively, what if the younger group was just busy and had other things to do and just couldnt call despite remembering. or that the young peoples group were told 1 hour ago and the old people were told just 1 min before to place their call. Closing these loopholes would strengthen the argument.

A. Strengthens - as explained above. It closes 1 loophole
B. we arent really concerned with who answered the calls. we care about who made the calls - so this option has no impact on the argument. keep as contender
C. Slightly strengthens - even if confused, B looks a better bet. this may strengthen if we assume that the older people of the young group forgot to make calls. this option closes that loophole.
D. Strengthens - what if the young group were from an impoverished background and could afford a telephone (i.e had no access). so the study would not be conclusive. maybe those 14 people all would have placed a call and only that 1 old man/woman would not have done so. this option closes that loophole.
E. strengthens - again this options says that there was an even playing field b/w the 2 groups.

thus option B has no impact on the argument and plays no role in strengthening it!
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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21 Jul 2017, 17:57
2
The author's conclusion is that "at least one type of memory {i.e. the type required to remember to make a phone call at a certain time} does not suffer as a person ages. How does the author arrive at that conclusion?

• A recent study compared Group A (persons sixty-five to seventy-five years old) to Group B (college students).
• Each member of the two groups was asked to call a certain phone number at a certain time.
• "The time when each call was initiated was recorded electronically", allowing the scientists conducting the study to see whether the group members made the calls at the requested times.
• "Group A proved far better at remembering to make a telephone call precisely at a specified time than did Group B." In other words, members of Group A did a better job of making the phone calls at the specific times requested.
• How much better did Group A do compared to Group B? "There were 14 lapses in Group B but only one lapse in Group A."

Thus, it seems as though the members of Group A were better able to remember to make a phone call at a certain time. But what information would be useful in establishing whether that line of reasoning is accurate? Any statement that IS useful should be eliminated because we are looking for the statement that would be the LEAST useful:

Quote:
(A) There was the same number of people in each group.

Yes, this would be useful to know. What if Group B had 1000 members but Group A only had 10? In that case, the difference in the number of lapses could be contributed to group size, not to a difference in memory between the two groups. Thus, (A) should be eliminated.

Quote:
(B) The same group of researchers answered the calls made by callers in both study groups.

All we need to know is whether the group members made their calls at the specific requested times. "The time when each call was initiated was recorded electronically," so it doesn't matter who answered the calls. (B) does NOT help us evaluate the argument or conclusion, so let's hang on to it.

Quote:
(C) Among the college students there were no persons more than forty years old.

Remember, the conclusion is that "at least one type of memory does not suffer as a person ages." This conclusion is based on evidence comparing a group of college students to a group of persons sixty-five to seventy-five years old. This argument ASSUMES that the college students were much younger, but what if that was not the case? What if most of the college students participating in the study were actually older adults or even senior citizens over sixty-five years old? That would certainly harm the author's argument. Statement (C) WOULD be useful in evaluating the conclusion, so it should be eliminated.

Quote:

What if the college students (Group B) did not have unrestricted access to telephones while the members of Group A did have such access? In that case, the difference in the number of lapses could be contributed to telephone access, not to a difference in memory between the two groups. Thus, (D) would be helpful and should be eliminated.

Quote:
(E) The members of the two groups received their instructions approximately the same amount of time before they were to make their telephone calls.

Again, this would provide an alternate reason to explain the difference in the number of lapses. If the college students in Group B were only give a very short amount of time and the members of Group A were given a lot of time, that might have given the members of Group A more time to prepare and make sure they would be ready to make the calls at the specified times. (E) would be helpful and should be eliminated.

Choice (B) is the best answer.

I hope that helps clear up some of the confusion!
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Re: In a recent study, each member of two groups of people Group A (compos  [#permalink]

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13 Oct 2018, 08:49
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).

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Re: In a recent study, each member of two groups of people Group A (compos   [#permalink] 13 Oct 2018, 08:49
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