### Sample Size Calculator for 2 Proportion Test

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

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

Proportion 1 Enter the first population proportion. For 50%, just enter 50Proportion 2 Enter the second population proportion. For 45%, just enter 45Number1 Number2 Number3 Number4 Number5 Sample Size (2 - proportion test) Minimum samples required to check if the two proportions are similar or not