Why not take the A train and just go right to http://www.uccs.edu/~lbecker/, where statistician Lee Becker from the University of California developed an effect size calculator? Or ditto for the one located at http://www.psychometrica.de/effect_size.html created by Drs. Wolfgang and Alexandra Lenhard? With these calculators, you just plug in the values, click Compute, and the program does the rest, as you see in Figure 11.2.
