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.

For further details, view the Help Document.

User Input

Program Output

Select Calculation and Test Type

Sample Size
Power

1 Sided
2 Sided

Select Hypothesis Test Parameters

Mean: Arm 1

Mean: Arm 2

Standard Deviation

Ratio of Sample Size Arm2/Arm1

Alpha

Power

Total Sample Size

Help Document