StatPowers
Confidence Level (e.g. 0.95)
Mean Sample Size Calculator
Target Margin of Error
Standard Deviation Estimate
Required Sample Size (n) =
Proportion Sample Size Calculator
Target Margin of Error
Proportion Estimate (p̂, optional)
Required Sample Size (n) =
Mean Sample Size / Power Calculator
Significance level
Test Type
One Sample T
Two Sample T
Absolute Effect Size
Standard Deviation Estimate
Power
Sample Size