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4. G*Power Download

Perform many different statistical tests.

G*Power Editor's review

FromHeinrich-Heine-University:G*Power 3 is a statistical power analysis program. It covers many different statistical tests of the F, t, chi-square, and z test families as well as some exact tests. G*Power 3 provides improved effect size calculators and graphics options, it supports both a distribution-based and a design-based input mode, and it offers five different types of power analyses. G*Power 3 is free.
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