Statistical Power Calculation
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Power: Z test - One sample sample proportions
This utility can be used to calculate statistical power gained with given sample size when you want to test whether there is significant difference betweeen a sample proportion and known / hypothesised proportion.
Formula used and other details
Number of participant with desired outcome in sample group (S1)
Enter positive number between 0 to 1000000
Required
Exact Number of successful outcomes in sample group.
Total Number of participant (N1)
Enter positive number between 1 to 1000000
Required
Sample size in your study. Should be between 1 and 1000000
Known / hypothetical proportion (P)
Enter positive number between 0.01 to 99.99
Required
Known / hypothetical proportion (P), against which sample proportion is compared.
Confidence Level %
Enter positive number between 0.01 to 99.99
Required
In percentage. Commonly used values are 95, 99 and 90. Should be between 0.01 to 99.99.
One or two sided test
One tailed or two tailed test
Power ( 1 - β) =