Sample Size Calculator For 2 Sample T Test

Hint: Use this calculator to determine the number of samples required to compare two population means

Confidence Level
The minimum acceptable probability of preventing type I error
- 90%
- 95%
- 99%
- 99.9%
Power of the Test
The minimum acceptable probability of preventing type II error
- 50%
- 80%
- 90%
- 95%
- 99%
confidence
Mean 1
Enter the 1st population or sample mean
Mean 2
Enter the 2nd population or sample mean
mean
Population Standard Deviation
This is the common standard deviation of the two populations or samples (also known as the pooled standard deviation)
Number
Sample Size for 2 Sample T Test
Minimum samples required to check if the two means are similar or not