Two Arm Normal

Two Arm Normal is a program to calculate either estimates of sample size or power for differences in means. The program allows for unequal sample size allocation between the two groups.

User Input
Program Output

Select Calculation and Test Type

Sample Size
1 Sided
2 Sided

Select Hypothesis Test Parameters

Mean: Arm 1
Mean: Arm 2
Standard Deviation
Ratio of Sample Size Arm2/Arm1

Total Sample Size