Sample Size Determination
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One Sample Proportion: Hypothesis test
This utility can be used to calculate required sample size when your aim is to test whether sample proportion is significantly different than a hypothesized proportion.
Formula used and other details
Your guesstimate of Sample Proportion %
Enter positive number between 0.01 to 99.99
Required
Approxiate estimate of Sample proportion (in percentage) based on previous studies / pilot studies etc. Should be between 0.01 to 99.99
Your Hypothesized / known Proportion %
Enter positive number between 0.01 to 99.99
Required
Hypothesized / known proportion, against which sample proportion is to be compared. Should be between 0.01 to 99.99
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.
Power ( 1 - β)
Enter positive number between 0.01 and 99.99
Required
In Percentage. Should be between 0.001 to 99.999. Common values are 80 % and 90 %
One sided or two sided
Enter either 1 or 2
Required
One tailed or two tailed hypothesis
Sample Size Required =