Replicability refers to the ability of a study or experiment to be repeated by other researchers and produce similar results. It is important in psychology because it allows for the confirmation and validation of findings, increasing the reliability and credibility of research.
External validity refers to the generalizability of research findings beyond the specific experimental conditions. In other words, it asks whether the results from a study can be applied to real-world situations.
Reliability refers to the consistency or stability of measurement over time. In psychology, it means that if an experiment or test were conducted again, it would yield similar results.
Meta-analysis: A meta-analysis is a statistical technique that combines data from multiple studies on a particular topic in order to provide more robust conclusions about relationships between variables.