G*Power

G*Power is a software tool used by researchers to determine the appropriate sample size and assess the statistical power of an experiment. It helps ensure that studies are designed effectively to detect meaningful effects without being overly large. By inputting details like expected effect size, significance level, and analysis type, G*Power calculates how many participants are needed or the likelihood that a study will find a real effect. This helps improve the reliability and efficiency of scientific research across various fields.