Homework Help: Statistics

Posted by Belinda on Thursday, April 7, 2011 at 6:59am.

If the mean of a set of data is 20.00 and 12.20 has a z-score of -1.30, then the standard deviation must be: What formula would you use to determine this?

Statistics - PsyDAG, Thursday, April 7, 2011 at 11:02am
Z = (score-mean)/SD

-1.3 = (12.2-20)/SD

Solve for the SD.

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