2007-03-20 01:45:02 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The standard deviation is a measure of the spread of values; so the smaller it is, the more correlated the data is.
It is the root-mean-square of the differences between each data value from it's mean.
2007-03-20 02:12:46 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Standard deviation is the measure that shows the displacement from the average. So if the data are grouped closer to the average st.dev. is smaller and vice versa.
2007-03-20 02:13:42 · answer #2 · answered by fernando_007 6 · 0⤊ 0⤋
Standard deviation is a measure of the dispersion of a set of data from its mean. The more spread apart the data is, the higher the deviation.
Mathematically it can be represented as:
s = Sqrt Sum{X_i-avg(X)}^2 divided by n-1
For further reading click on the sight shown below:
http://www.childrensmercy.org/stats/definitions/stdev.htm
2007-03-20 02:25:58 · answer #3 · answered by lonelyspirit 5 · 0⤊ 0⤋