Math Forum - Ask Dr. Math

The Math Forum

$Ask Dr. Math - Questions and Answers from our Archives$ $_____________________________________________$
Associated Topics || Dr. Math Home || Search Dr. Math
$_____________________________________________$

Finding the Standard Deviation


Date: 8/5/96 at 11:35:0
From: Anonymous
Subject: Finding the Standard Deviation

What is the formula for calculating the standard deviation?  I cannot 
seem to find it in the database. 

Thanks.

Date: 8/5/96 at 11:56:3
From: Doctor Anthony
Subject: Re: Finding the Standard Deviation

If you require the s.d. for a population size n, the formula is:

sqrt[SIGMA{x^2/n} - m^2]   

where x takes all values in turn in the population, and m is the mean 
calculated from SIGMA{x/n}.  SIGMA means 'sum of'.

-Doctor Anthony,  The Math Forum
 Check out our web site!  http://mathforum.org/dr.math/


Date: 8/5/96 at 11:57:12
From: Doctor Paul
Subject: Re: Finding the Standard Deviation

Standard Deviation is the square root of the variance.

-Doctor Paul,  The Math Forum
 Check out our web site!  http://mathforum.org/dr.math/

Associated Topics:
High School Statistics

Search the Dr. Math Library:

Find items containing (put spaces between keywords):

Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

Math Forum Home || Math Library || Quick Reference || Math Forum Search
_____________________________________