## Confucious Group Title What is the relationship between variance and standard deviation? 2 years ago 2 years ago

1. EbnorEqvine Group Title

Standard deviation = sqrt(variance), variance = standard deviation^2

2. Confucious Group Title

that's all? okay!

3. EbnorEqvine Group Title

yes

4. Confucious Group Title

oh cool. i was expecting something long and complicated, like what they actually do, what their purpose is

5. EbnorEqvine Group Title

Well, say you have a data set, say, {1,2,3,4,5,6}.. the standard deviation of this data set would simply be the square root of the sum of the differences between each element and the average squared, divided by the number of elements....

6. EbnorEqvine Group Title

Well, say you have a data set, say, {1,2,3,4,5,6}.. the standard deviation of this data set would simply be the square root of the sum of the differences between each element and the average squared, divided by the number of elements....$\sigma = \sqrt{((x _{1}-x)^2+(x _{2}-x)^2...+(x _{k}-x)^2)/k}$

7. EbnorEqvine Group Title

x being the average, k being the number of elements in the data set, and that funny looking symbol (sigma) signifying standard deviation. k divides the sum of all of those numbers, just in case it isn't clear.

8. Confucious Group Title

yh sure