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#1 2013-12-30 18:12:02

mathaholic
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

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


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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#2 2013-12-30 18:16:23

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,791

Re: Standard Deviation Part 1

Hi mathaholic;


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#3 2013-12-30 21:05:06

mathaholic
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

Re: Standard Deviation Part 1

Why you don't get it? It's just step by step anyways.


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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#4 2013-12-30 22:18:29

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,791

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#5 2013-12-31 14:50:15

mathaholic
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

Re: Standard Deviation Part 1

It's correct!


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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#6 2013-12-31 15:20:57

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,791

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

#7 2013-12-31 19:29:45

mathaholic
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,870
Website

Re: Standard Deviation Part 1

*slaps myself*


"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?
3.141592653589793238...

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