I am planning a study where the endpoint of the current practice is 40% successful. The null hypothesis will be rejected if the intervention produces a 60% success rate (treatment effect of interest). We are happy with a significance criterion of 0.05 and a $\beta$ 0.8. The study will be to intervention or to current treatment, randomised and blinded. What is the sample size needed?
How do I do a power calculation where the effect size and values of $\alpha$ and $\beta$ are known?
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statistics