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January 31, 2015

January 31, 2015

Posted by **Jessica** on Wednesday, June 22, 2011 at 8:14pm.

16.4, 15.7, 16.2, 15.8 17.1

15.8, 15.9, 16.0, 16.4 15.0

- statistics -
**PsyDAG**, Thursday, June 23, 2011 at 11:02am95% interval = mean ± 1.96 SEm

SEm = SD/√(n-1)

Find 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

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