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Hi! Would a group of 30 420 participants (15 120 in each the placebo and intervention group), a big enough sample to provide a 95%

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Would a group of 30 420 participants (15 120 in each the placebo and intervention group), a big enough sample to provide a 95% confidence interval? I tried to find the calculation but I can not get the same answer twice. Can you help me by showing me how it is calculated? Thank you.

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