How Many Participants Do We Have to Include in Properly Powered Experiments? A Tutorial of Power Analysis with Reference Tables

• Published in: Journal of cognition Vol. 2; no. 1; p. 16
• Main Author: Brysbaert, Marc
• Format: Journal Article
• Language: English
• Published: England Ubiquity Press 19.07.2019
• Subjects: Mathematical modelling; Review; Statistical analysis; Working memory; Mathematical modeling; Statistical analysis; Working memory

Given that an effect size of d = .4 is a good first estimate of the smallest effect size of interest in psychological research, we already need over 50 participants for a simple comparison of two within-participants conditions if we want to run a study with 80% power. This is more than current pract...