TestMagic

Serenity · 2007 November 5th, 12:09 AM

So how do you solve this one? Thanks

Serenity · 2007 November 5th, 02:06 AM

Do we really have to measure the shape of the gauss curve or some crap like that?

coyote · 2007 November 5th, 03:13 AM

Knock Out!

DWarrior · 2007 November 5th, 09:11 AM

can you post it for the rest of us?

ImageShack® - Hosting

coyote · 2007 November 5th, 09:44 AM

Quote:

Originally Posted by DWarrior

can you post it for the rest of us?

ImageShack® - Hosting

He has already posted the question ! The attachment is the same image!

DWarrior · 2007 November 5th, 09:49 AM

All I see is his first post:

Quote:

So how do you solve this one? Thanks

Attached Images

propb.bmp (327.4 KB, 4 views)

and second post:

Quote:

Do we really have to measure the shape of the gauss curve or some crap like that?

I can't view the .bmp

coyote · 2007 November 5th, 09:56 AM

Sorry DWarrior. But the image in his post was visible to me. So I thought it could be viewed by all. Anyway, I have posted it now.

DWarrior · 2007 November 5th, 10:28 AM

Yeah, that is a tough one, can't really tell if that part is convex or concave without using the formula or having a stats chart.

coyote · 2007 November 5th, 10:29 AM

Quote:

Originally Posted by DWarrior

Yeah, that is a tough one, can't really tell if that part is convex or concave without using the formula or having a stats chart.

True. I too need to revise my statistical concepts!

DWarrior · 2007 November 5th, 12:34 PM

So I found the necessary property:
inflection points of a normal curve occur at +/- 1 SD away from the mean.

If you apply the 68/95/99.5 rule, we know the inflection point occurs at 34%, which is after the 30% mark, meaning the curve is bulging upwards at 30%.

450 is half-way between the two y-values, while 30% is half-way between the two x-values. The curvature is exaggerated for emphasis:

k<30, so B

2007 November 5th, 12:34 PM	#10 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	So I found the necessary property: inflection points of a normal curve occur at +/- 1 SD away from the mean. If you apply the 68/95/99.5 rule, we know the inflection point occurs at 34%, which is after the 30% mark, meaning the curve is bulging upwards at 30%. 450 is half-way between the two y-values, while 30% is half-way between the two x-values. The curvature is exaggerated for emphasis: k<30, so B Last edited by DWarrior : 2007 November 5th at 07:41 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

2007 November 5th, 02:06 AM	#2 (permalink)
Serenity Within my grasp! Join Date: Oct 2007 Posts: 141	Do we really have to measure the shape of the gauss curve or some crap like that?

2007 November 5th, 03:13 AM	#3 (permalink)
coyote TestMagic Fan! Join Date: Aug 2007 Location: India Posts: 347	Knock Out!

2007 November 5th, 09:11 AM	#4 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	can you post it for the rest of us? ImageShack® - Hosting

2007 November 5th, 09:56 AM	#7 (permalink)
coyote TestMagic Fan! Join Date: Aug 2007 Location: India Posts: 347	Sorry DWarrior. But the image in his post was visible to me. So I thought it could be viewed by all. Anyway, I have posted it now.

2007 November 5th, 10:28 AM	#8 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	Yeah, that is a tough one, can't really tell if that part is convex or concave without using the formula or having a stats chart.

TestMagic

Free GMAT, GRE, SAT Test, TOEFL practice tests