DiscussWorldIssues - Socio-Economic Religion and Political Uncensored Debate - View Single Post - math guys: how does one figure out a standard deviation

**averkif** · 05-09-2007, 06:47 AM

The population standard deviation can be simply calculated as follows:

1) sum all values
2) sum the squares of all values
3) square the result from (1)
4) Divide (3) by N (the number of values)
5) Subtract (4) from (2)
6) Divide (5) by N
7) Take the square root of (6)

So, if we have 3, 6, and 7 as values:

1) = 3+6+7 = 16
2) = 9 + 36 + 49 = 94
3) = 16*16 = 256
4) = 256/3 = 85.33
5) = 94 - 85.33 = 8.67
6) = 8.67/3 = 2.89
7) = SQRT(2.89) = 1.7

05-09-2007, 06:47 AM	#3
averkif Join Date Oct 2005 Posts 405 Senior Member	The population standard deviation can be simply calculated as follows: 1) sum all values 2) sum the squares of all values 3) square the result from (1) 4) Divide (3) by N (the number of values) 5) Subtract (4) from (2) 6) Divide (5) by N 7) Take the square root of (6) So, if we have 3, 6, and 7 as values: 1) = 3+6+7 = 16 2) = 9 + 36 + 49 = 94 3) = 16*16 = 256 4) = 256/3 = 85.33 5) = 94 - 85.33 = 8.67 6) = 8.67/3 = 2.89 7) = SQRT(2.89) = 1.7
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