eng TQMP Tutorials in Quantitative Methods for Psychology 1913-4126 2007-09-01 3 2 60 62 article Denis Cousineau denis.cousineau@umontreal.ca 1 Université de Montréal We show how to compute the power of a 2-group t test using SPSS or Mathematica. To do so, it is necessary to estimate the hypothetical effect size, if an effect is to be found. http://www.tqmp.org/Content/vol03-2/p060/p060.pdf Statistics statistical power t test