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July 22, 2014

July 22, 2014

Posted by **LUA** on Saturday, January 19, 2013 at 1:03pm.

Are all yields obtained within one standard deviation of the mean?

- math standard deviation -
**PsyDAG**, Sunday, January 20, 2013 at 1:05pmFind 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

I'll let you do the calculations.

Without even calculating the SD, the answer is no. ±1 SD is only about 68% of the scores.

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