Dear all
I was hoping someone could help me with the following.
In an experiment with 3 groups (2x treatment 1 x control), we are able to recruit 400 people. We are expecting a 0.05 difference in means between the control and treatment groups. We expect the SD to be 0.3. Significance level 0.05. I'm unsure how to plug this into a power calculator to work out how much power we have. Any help would be greatly appreciated!
Daniel
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