Minimum Sample Size Calculator
Calculate the minimum sample size needed to achieve desired statistical power for various types of hypothesis tests.
Test Parameters
Minimum Sample Size
32
One-sample t-test
Effect Size
0.5
Medium
Power
80%
Critical Values:
Z (alpha):
1.960
Z (power):
0.842
Alpha:
0.05
Minimum Sample Size for Power
This calculator determines the minimum number of observations needed to detect an effect of a given size with specified statistical power. Using too few subjects may result in a study that cannot detect real effects (Type II error), while using too many wastes resources.
Effect Size Guidelines
Small: 0.2
Subtle effect
Medium: 0.5
Visible effect
Large: 0.8
Obvious effect
Help us improve!
How would you rate the Minimum Sample Size Calculator?
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
Formula Source: Standard Mathematical References
by Various