You are designing a study to be evaluated with a two-sample
nondirectional independent t test at a = .05.
You want .90 power. You expect
Cohen’s d to be about .40. How many subjects will you need peer group?
Thank you for the opportunity to help you with your question!
where j is the power of the test
d is the cohen's d
n is the sample size per group
the number of subjects is 10 per sample
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