Participants will be drawn from CriticalMix, with the additional criterion that no participant invited to participate in study two could be invited to participate in study four. A power analysis of the ‘Genes’ group versus the ‘Genes: rare’ group from study three suggests that the Odds ratio of learning the cause of low self-control being a ‘rare gene’ causes a reduction in guilty verdicts by OR = .378 over learning the cause was just ‘genes for’ low self-control. To replicate this effect with 80% power would require 129 participants per condition. Thus, as we are increasing the number of conditions beyond those two, and attempting to extend the finding into new scenarios whose effect size is unknown, we sought to maximize power by collecting 1,500 participants. Participants will be drawn in a stratified way with unequal probabilities of selection, so that the people who complete each survey will resemble the nation's adult population (according to the most recently available Current Population Survey, conducted by the U.S. Census Bureau) in terms of gender, age, education, ethnicity (Hispanic vs. not), race (allowing each respondent to select more than one race), region, and income.
