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February 1, 2015

February 1, 2015

Posted by **Paula** on Wednesday, April 17, 2013 at 8:30pm.

66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

- STATISTICS -
**PsyDAG**, Thursday, April 18, 2013 at 2:59pmFind 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

99% = mean ± 2.575 SEm

SEm = SD/√n

I'll let you do the calculations.

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