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April 20, 2014

April 20, 2014

Posted by **kelly** on Tuesday, February 5, 2013 at 9:52pm.

Why is the computational formula easier to use when computing variance and standard deviation?

- stats -
**PsyDAG**, Wednesday, February 6, 2013 at 2:00pmThe sum of the deviations (unsquared) from the mean should always = zero, since the mean serves as a fulcrum (balance point) for the distribution.

You need to square the sum of the scores rather than the sum of the squared deviations (squaring*each*scores deviation from the mean).

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