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Sample size
Confidence interval of a difference between proportions
Sample size for Confidence interval of a difference between proportions
Confidence interval
Confidence Interval (%):
90%
95%
99%
Input
Proportion in group 1 (%):
Enter a value.
Proportion in group 2 (%):
Enter a value.
Confidence interval width (2-sided):
Enter a value.
Ratio of sample sizes in Group 1 / Group 2:
Enter a value.
Results
Number of cases required in group 1:
Number of cases required in group 2:
Total sample size (2 groups together):
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