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April 17, 2015

April 17, 2015

Posted by **jo** on Monday, September 19, 2011 at 7:21pm.

- statistics -
**PsyDAG**, Tuesday, September 20, 2011 at 2:51amFind the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Z = (score-mean)/SD

I'll let you do the calculations.

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