The replication crisis in psychology

Only thirty-six percent of psychology studies successfully replicated with statistical significance in a major hundred-study project.

Replicated studies showed effect sizes that were less than half as strong as the original published findings.

Ego depletion and power posing theories failed to hold up under large-scale, rigorous replication efforts.

P-hacking allows researchers to manipulate data analysis until they reach the desired point zero five significance level.

The file drawer effect hides unsuccessful studies, leaving only misleadingly positive results in the public record.

Pre-registration prevents researchers from changing their hypotheses after they have already seen the data results.