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#1 2013-12-30 18:12:02
- mathaholic
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- Registered: 2012-11-29
- Posts: 3,251
Standard Deviation Part 1
Since Euler Avenue is a little inactive, let's give life to it:
Okay, so I'll start from showing you some examples of the standard deviation, and not gonna teach you, but I just want you to correct me in case of my mistakes in calculation.
Note: I will use the whole population for these examples.
1. 62, 35, 17, 27 and 59
62+35+17+27+59
97+44+59
103+97
200
200 / 5 = 40
62 - 40 = 22
35 - 40 = -5
17 - 40 = -23
27 - 40 = -13
59 - 40 = 19
22 ^ 2 = 484
5 ^ 2 = 25
17 ^ 2 = 289
27 ^ 2 = 729
59 ^ 2 = 3481
484+25+289+729+3481
509+1018+3481
4499+509
5008
5008 / 5 = 1,001.6 ~ 1,002
(sqrt)1,002 = 31.65 ~ 32
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#2 2013-12-30 18:16:23
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Standard Deviation Part 1
Hi mathaholic;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2013-12-30 21:05:06
- mathaholic
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Re: Standard Deviation Part 1
Why you don't get it? It's just step by step anyways.
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#4 2013-12-30 22:18:29
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Standard Deviation Part 1
I meant I do not think that is the right answer.
22 ^ 2 = 484
5 ^ 2 = 25
17 ^ 2 = 289
27 ^ 2 = 729
59 ^ 2 = 3481
Please check that.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#5 2013-12-31 14:50:15
- mathaholic
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- Registered: 2012-11-29
- Posts: 3,251
Re: Standard Deviation Part 1
It's correct!
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#6 2013-12-31 15:20:57
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Standard Deviation Part 1
Hi;
You are squaring the wrong numbers.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#7 2013-12-31 19:29:45
- mathaholic
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- From: Earth
- Registered: 2012-11-29
- Posts: 3,251
Re: Standard Deviation Part 1
*slaps myself*
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