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Home Sample size calculation Confidence interval of a difference between means

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Sample size for Confidence interval of a difference between means

Confidence interval

Confidence Interval (%):  

Input

Pooled standard deviation:
Confidence interval width (2-sided):
Ratio of sample sizes in Group 1 / Group 2:

Results

Number of cases required in group 1:
Number of cases required in group 2:
Total sample size (2 groups together):