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You are here: Home / Category Index / Algebra / Standard Deviation - Explanation And Calculation
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Standard Deviation - Explanation And Calculation - By David Murray
How to use this applet:How to use the applet:
Operating the buttons is done as follows:
[1] Credits button:
to pop up a text area with information on the applet.
[2] Reset Button:
This button resets all the calculations.
[3] Get Deviation:
This button calculates the individual deviations for each individual input and displays these deviations beside the various inputs.
[4] Get Standard Deviation:
Calculates the standard deviation for the 10 input terms and diplays it.
[5] Get Mean:
Calculates the mean of the input variables. Notes on the maths used in the applet:The maths behind standard deviation is quite simple. I don't know how to include formulae signs in this document so I'll have to do it the awkward way... explanation in English. The standard deviation (D) for an array of values is equivalent to the square root of [(top line) the sum of the deviations(Ed) divided by(bottom line) the number of terms]. the deviation(d) of a term in the array is equivalent to the mean of all the numbers in the array minus the individual number itself. The sum of the variances is the sum of this.
Other useful information: About operation of the Applet:
Unfortunately the user must input all ten values in the input fields for the applet to do it's calculations!! Sorry
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