I don't know how to write sigma notation here, so I am going to word it instead
sum of square of the difference of the x and mean = sum of the square of the x minus square of the sum of x divided by n
I have been using this formula, and I know it works.
But now that I think about it...n has not been squared. I know x bar is equal to sum of x divided by n
I don't know whether you can understand what I am trying to say
I thank you all for your precious time,
Judi