You are designing a three group study to be evaluated with a one-way Nova at

a =.05. You expect effect size n to be about .29. How many subjects will you need per group for .80?

Thank you for the opportunity to help you with your question!

j=d*sqrt(n/2)

where j is the power of the test

d is the cohen's d

n is the sample size per group

0.80=0.29 sqrt(n/2)

0.64=0.0841 n/2

1.28=0.0841n

The subjects should be 15 per group

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