Elite athletes perform better under the pressure of competition; beginners perform worse.
Can you rule out the selection effect? (Which would be that people who don’t happen to perform better under the pressure of competition, don’t become elite athletes.)
Can you rule out the selection effect? (Which would be that people who don’t happen to perform better under the pressure of competition, don’t become elite athletes.)
#necro, but yes. Longitudinal observation shows that the same people perform worse under pressure as amateurs, and better under pressure at the end.