### Sample Size Calculator for 2 Sample T Test

Hint: Use this calculator to determine the number of samples required to compare two population meansConfidence Level The minimum acceptable probability of preventing type I error90% 95% 99% 99.9%

Power of the Test The minimum acceptable probability of preventing type II error50% 80% 90% 95% 99%

confidence Mean 1 Enter the 1st population or sample meanMean 2 Enter the 2nd population or sample meanmean 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