Another statistics question...
Gravetter and Wallnau's "Statistics for the Behavioral Sciences uses what
they refer to as the computational formula for the sum of the squared
deviations from the mean (SS). The formula is:
SS = the sum of the squared scores minus the sum of the scores squared,
divided by the number of scores.
Does anyone know the mathematical proof for this formula's equivalence to
the definitional formula?
The definitional formula being:
SS = The sum of the squared deviations from the mean
Thanks for whatever knowledge or references you might be able to fill me
in on.
Judith Roberts
City College of San Francisco
