| Author |
Message |
|
SRobin1068
|
Post subject: Does data set A = {1, 2, x} have a greater standard  Posted: Sun Jul 15, 2007 7:25 pm |
|
|
|
|
The question reads as follows:
Does data set A = {1, 2, x} have a greater standard deviation than data set
B = {1, 2, 3}?
(1) x is greater than 3.
(2) x is less than 1.
In my opinion it appears that statements 1 and 2 contradict each other (how can x be greater than 3 if it is less than 1?). If I understand the idea of DS correctly, the statements can never contradict each other. Can someone please explain what I am not understanding here?
Thanks!
Nina
|
|
  |
|
 |
|
StaceyKoprince
|
Post subject: Posted: Mon Jul 16, 2007 10:54 pm |
|
 |
| ManhattanGMAT Staff |
|
|
Posts: 6064
Location: San Francisco
|
|
Can you please give me the name of the question so I can go look it up in the system? You can find the name on the list of questions when you go in to review your test. Thanks!
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
|
|
| |
|
|
|
SRobin1068
|
Post subject: MGMAT CAT DS question - standard deviation Posted: Tue Jul 17, 2007 11:06 am |
|
|
|
|
Name of problem is "Average Deviation".
Thanks,
Nina
|
|
| |
|
|
|
StaceyKoprince
|
Post subject: Posted: Tue Jul 17, 2007 6:56 pm |
|
|
| ManhattanGMAT Staff |
|
|
Posts: 6064
Location: San Francisco
|
|
Thanks! And great catch, Nina - you are completely right. We've pulled this one from our CAT. Looks like you're ready for the test! :D
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
|
|
| |
|
|
|
StaceyKoprince
|
Post subject: Posted: Tue Jul 17, 2007 7:19 pm |
|
|
| ManhattanGMAT Staff |
|
|
Posts: 6064
Location: San Francisco
|
|
One more thing! We'd like to offer you a little something as a thank you for catching this. Do you already have a test simulation booklet? (The laminated booklet you use during the test for scratch paper.) If not, we'd like to send you one - let me know!
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
|
|
| |
|
|
|
SRobin1068
|
Post subject: MGMAT CAT DS question - standard deviation Posted: Tue Jul 17, 2007 9:11 pm |
|
|
|
|
Thanks for the offer. That'd be great! Can I send my address via email instead of on this forum?
Nina
|
|
| |
|
|
|
StaceyKoprince
|
Post subject: Posted: Wed Jul 18, 2007 12:10 am |
|
|
| ManhattanGMAT Staff |
|
|
Posts: 6064
Location: San Francisco
|
Yeah - just email my colleague Danielle ( danielle@manhattangmat.com). She already knows about you! (I've told her to look out for an email from Nina, so mention that and the fact that you're the one who found a flaw in one of our problems on the forum.)
Again, nice job! :)
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
|
|
| |
|
|
|
yousuf_azim
|
Post subject: Re: Does data set A = {1, 2, x} have a greater standard Posted: Fri Sep 02, 2011 11:48 pm |
|
|
| Students |
|
|
Posts: 45
|
|
Is there any error in the question?
RGRDS
|
|
| |
|
|
|
jnelson0612
|
Post subject: Re: Does data set A = {1, 2, x} have a greater standard Posted: Mon Oct 10, 2011 9:22 pm |
|
|
| ManhattanGMAT Staff |
|
|
Posts: 1857
|
yousuf_azim wrote: Is there any error in the question?
RGRDS Yes, the statements can never contradict each other, and it is impossible to have a number that is both greater than 3 and less than 1. We have pulled this question from our CATs.
_________________
Jamie Nelson
ManhattanGMAT Instructor
|
|
| |
|
|
|
subbiah1.an
|
Post subject: Re: Does data set A = {1, 2, x} have a greater standard Posted: Tue Oct 11, 2011 6:31 am |
|
|
| Students |
|
|
Posts: 2
|
jnelson0612 wrote: yousuf_azim wrote: Is there any error in the question?
RGRDS Yes, the statements can never contradict each other, and it is impossible to have a number that is both greater than 3 and less than 1. We have pulled this question from our CATs. I am trying to see where I am going wrong in visualizing the solution. Sorry, if this is very basic/ stupid. When I first read this question, I imagined X on the number line. For the first statement, X starts from 3 and goes. And for the second statement, X starts from 1 and goes in the opposite direction. When we are thinking about the possibility for 'D' (individually sufficient), don't we need to think both as independent statements? In that case, wouldn't this be valid? When we think about 'C' as solution, of course on combining the two statements, it's not valid.
|
|
| |
|
|
|
StaceyKoprince
|
Post subject: Re: Does data set A = {1, 2, x} have a greater standard Posted: Fri Nov 11, 2011 10:18 pm |
|
|
| ManhattanGMAT Staff |
|
|
Posts: 6064
Location: San Francisco
|
|
Yes, but it's still the case that the two statements are not supposed to contradict each other no matter what. That's why we pulled it.
_________________
Stacey Koprince
Instructor
Director of Online Community
ManhattanGMAT
|
|
| |
|
|
|
