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%
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confidence
Mean 1
Enter the 1st population or sample mean
Mean 2
Enter the 2nd population or sample mean
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mean
Population Standard Deviation
This is the common standard deviation of the two populations or samples (also known as the pooled standard deviation)
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Number
Sample Size for 2 Sample T Test
Minimum samples required to check if the two means are similar or not