Sample Size Determination
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One Sample Mean: Hypothesis test
This utility can be used to calculate required sample size when your aim is to test whether sample mean is significantly different than a hypothesized mean.
Formula used and other details
Your guesstimate of Sample mean
Required
Approxiate estimate of Sample mean based on previous studies / pilot studies etc.
Your guesstimate of Standard Deviation of Sample mean
Required
Approxiate estimate of Standard Deviation of sample mean, based on previous studies / pilot studies etc.
Your Hypothesized / known mean
Required
Hypothesized / known mean, against which sample mean is to be 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.
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 =