Sample size only matters for statistical power. After certain point, the diminishing returns will fall of a cliff. Lay persons seems to have mistrust of seemly

Sample size only matters for statistical power. After certain point, the diminishing returns will fall of a cliff. Lay persons seems to have mistrust of seemly small sample sizes, but they need to understand that doubling the size of the study only improves statistical in 5-10% for dichotomous studies. If we mandated a bigger sample size without taking into account why it's relevant and how it's calculated, it will make every study cost prohibited.