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July 28, 2014

July 28, 2014

Posted by **Jacob** on Saturday, November 27, 2010 at 2:20pm.

- statistics -
**PsyDAG**, Sunday, November 28, 2010 at 10:48amWhat do you mean by "P20 and P65"?

If I assume that those are percentiles, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z scores corresponding to the proportions indicated. Insert the values into the following equation.

Z = (score-mean)/SD

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