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Re: DEM CHARSZUOHV*SI(\cnm uvH(uhu89eghjaqu9p\ehj

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Aminulus is not online. Aminulus
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09 Oct 2012 12:37 PM
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Aminulus is not online. Aminulus
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09 Oct 2012 12:46 PM
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Aminulus is not online. Aminulus
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09 Oct 2012 01:20 PM
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awsomeness7878 is not online. awsomeness7878
Joined: 23 Nov 2008
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09 Oct 2012 01:24 PM
Mean: 491

SD: 1631.844?
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superkirby0 is not online. superkirby0
Joined: 03 Aug 2009
Total Posts: 8897
09 Oct 2012 01:25 PM
The answer is 42.
It's always 42.

STRANGE, ISN'T IT?!

STRANGE, ISN'T IT?!
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Aminulus is not online. Aminulus
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09 Oct 2012 01:28 PM
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awsomeness7878 is not online. awsomeness7878
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09 Oct 2012 01:29 PM
The mean IS 491, I'm not sure about the SD, though.
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sdfgw is not online. sdfgw
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09 Oct 2012 01:31 PM
but

stats is awful and boring
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awsomeness7878 is not online. awsomeness7878
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09 Oct 2012 01:31 PM
The SD is:

68.1428571...

This time I'm SURE.
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Aminulus is not online. Aminulus
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09 Oct 2012 01:46 PM
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generation418 is not online. generation418
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09 Oct 2012 01:47 PM
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mikeyman10ash is not online. mikeyman10ash
Joined: 29 Aug 2010
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09 Oct 2012 01:50 PM
I will never understand this kind of math.
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awsomeness7878 is not online. awsomeness7878
Joined: 23 Nov 2008
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09 Oct 2012 01:50 PM
Well? Pay up.
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sdfgw is not online. sdfgw
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09 Oct 2012 01:52 PM
yeah the mean is easy

there are loads of types of SD though - since it's given you the sum of squares it's most likely asking for the type of SD that uses that

i can never remember this, it's been nearly a year since i finished this module

i _think_ that's the square root of the sum of squares - square of sum

or the other way around

aa
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mikeyman10ash is not online. mikeyman10ash
Joined: 29 Aug 2010
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09 Oct 2012 01:54 PM
Mean, median, mode, and range is easy.
But standard deviation is just
aaaaaaaaaaaa I don't understand this *cracks computer screen*
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nolanbeast2256 is not online. nolanbeast2256
Joined: 29 Oct 2010
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09 Oct 2012 01:56 PM
*Cough* GOOGLE *Cough*

d-Nolan-b
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awsomeness7878 is not online. awsomeness7878
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09 Oct 2012 01:56 PM
SD:

subtract average from every sample

Square results

Add results

Divide result by one less than the number of items on the list

take square root of result.

The CORRECT SD, btw, is 4.867...

I forgot the last step.
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mikeyman10ash is not online. mikeyman10ash
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09 Oct 2012 01:58 PM
Ok. Now I have that in a save file on Notepad called Math so I can go back to it if I ever need it. I usually do that, lol.
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sdfgw is not online. sdfgw
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09 Oct 2012 01:58 PM
but you don't know every sample
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awsomeness7878 is not online. awsomeness7878
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09 Oct 2012 02:00 PM
>but you don't know every sample

Yeah, but I do know the sum of every sample squared, and so I can skip a few steps by just subtracting the mean squared by the sum of all of the samples squared.
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sdfgw is not online. sdfgw
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09 Oct 2012 02:02 PM
sum(x - mean)^2 = mean^2 - sum(x)^2

wow is that actually true

checking this online
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awsomeness7878 is not online. awsomeness7878
Joined: 23 Nov 2008
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09 Oct 2012 02:03 PM
Multiplication is communitive
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sdfgw is not online. sdfgw
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09 Oct 2012 02:06 PM
commutative

that just means a*b = b*a how does that change anything
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awsomeness7878 is not online. awsomeness7878
Joined: 23 Nov 2008
Total Posts: 9512
09 Oct 2012 02:07 PM
Well, the concept actually does apply here, but nvm then.
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N00bhunter is not online. N00bhunter
Joined: 22 Oct 2008
Total Posts: 448
09 Oct 2012 02:14 PM
my head hurts

i've never been taught about SD yet lol
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