Statistical Power Calculation
Home
Significance tests
Puzzles
About
Contact
Power: Two Samples Mean: Hypothesis test
This utility can be used to calculate statistical power gained with given sample size when your aim is to test whether two sample means are significantly different.
Formula used and other details
First Sample mean (μ1)
Required
First Sample mean in your study.
Standard Deviation of first Sample mean (SD1)
Required
Standard Deviation of first sample mean in your study.
Total Number of participant in first group (N1)
Enter positive number between 1 to 1000000
Required
Sample size in first group (related to μ1 and SD1). Should be between 1 and 1000000
Second Sample mean (μ2)
Required
Second Sample mean in your study.
Standard Deviation of second Sample mean (SD2)
Required
Standard Deviation of second sample mean in your study.
Total Number of participant in second group (N2)
Enter positive number between 1 to 1000000
Required
Sample size in second group (related to μ2 and SD2). Should be between 1 and 1000000
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 sided or two sided
Enter either 1 or 2
Required
One tailed or two tailed hypothesis
Power ( 1 - β) =