Why, for Sample Standard Deviation, Divide by N-1, Instead of N?

Relevant Pages

• Re: prime number
  ... e265koba@st.yatsushiro-nct.ac.jp (Chika) wrote: ... # is a prime number using bc (calculation language). ... In general, divide N by each prime less than it, and see if the remainder ... can divide by N by all numbers from 2 and N-1. ...
  (comp.programming)
• Re: Biased and unbiased std dev
  ... >invalid when n=1 and hence they divide by. ... The estimate of s^2, when divided by n-1, is unbiased because ... if the residuals of the x's from their regression ...
  (sci.stat.math)
• Re: circular permutation
  ... one has to divide by and calculate ... >>Dirk Vdm ... Do I get part credit since my answer sometimes works? ... Dividing by (n-1) fails with 6,3 already. ...
  (sci.math)
• Re: Finite fields
  ... "The order of an element must divide?" ... > Does an algorithm exist for finding the primitive elements of a finite ... > I am able to reduce the search space by taking a rep. of each each eq. ... > checking whether its order is one of the prime factors of (n-1). ...
  (sci.math)
• Re: Standard Deviation
  ... If you divide that value by N or N-1 you get the variance, which is s squared if you divide by N, or sigma squared if you divide by N-1. ... From that value again, you get the standard deviation by extracting the square root, which is either s or sigma. ...
  (borland.public.delphi.non-technical)