Aminulus
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| Joined: 06 Jan 2012 |
| Total Posts: 12186 |
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Aminulus
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| Joined: 06 Jan 2012 |
| Total Posts: 12186 |
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Aminulus
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| Joined: 06 Jan 2012 |
| Total Posts: 12186 |
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| 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
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| Joined: 06 Jan 2012 |
| Total Posts: 12186 |
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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
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| Joined: 08 Jan 2009 |
| Total Posts: 41681 |
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| 09 Oct 2012 01:31 PM |
but
stats is awful and boring |
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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
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| Joined: 06 Jan 2012 |
| Total Posts: 12186 |
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| 09 Oct 2012 01:50 PM |
| I will never understand this kind of math. |
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sdfgw
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| Joined: 08 Jan 2009 |
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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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| 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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| 09 Oct 2012 01:56 PM |
*Cough* GOOGLE *Cough*
d-Nolan-b |
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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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| 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
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| Joined: 08 Jan 2009 |
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| 09 Oct 2012 01:58 PM |
| but you don't know every sample |
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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
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| Joined: 08 Jan 2009 |
| Total Posts: 41681 |
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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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| 09 Oct 2012 02:03 PM |
| Multiplication is communitive |
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sdfgw
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| Joined: 08 Jan 2009 |
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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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| 09 Oct 2012 02:07 PM |
| Well, the concept actually does apply here, but nvm then. |
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| 09 Oct 2012 02:14 PM |
my head hurts
i've never been taught about SD yet lol |
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